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Expressions-with-variables/598406: I need help immediately :( I don't understand these equations , I was absent. I'm crying :(( I can't do all of these. [ Substitution ] y=3x-4 y= -5x + 4 y=2x+13 y=-4x-23 y=3x+20 y=x+4 y=-4x-8 y=3x+13 ------ -x+y=6 y=-7+14 y=-5x+12 x+y=-3 x+y=-6 y=-3x-10 -4x+5y=-15 4x+y=21 1 solutions Answer 378569 by jim_thompson5910(28708)   on 2012-04-12 23:01:41 (Show Source): You can put this solution on YOUR website! The basic idea is to replace one variable with another expression (of that other variable) so you can eliminate one variable. This way, you'll have a single equation with one variable. You then solve that equation to find the value of that variable. Then you use the solution to find the value of the previously eliminated variable. ======================================================= # 1 y=3x-4 y= -5x + 4 y=3x-4 -5x+4=3x-4 ... Note: I'm replacing the 'y' with -5x+4 (since y = -5x+4) -5x-3x=-4-4 -8x=-8 x=-8/(-8) x = 1 ------------- y = 3x-4 y = 3(1)-4 ... Here I'm replacing 'x' with 1 (since x = 1) y = 3-4 y = -1 So x = 1 and y = -1 ======================================================= # 2 y=2x+13 y=-4x-23 y=2x+13 -4x-23=2x+13 -4x-2x=13+23 -6x=36 x=36/(-6) x = -6 -------------- y = 2x+13 y = 2(-6)+13 y = -12+13 y = 1 So x = -6 and y = 1 ======================================================= # 3 y=3x+20 y=x+4 y=3x+20 x+4=3x+20 x-3x=20-4 -2x=16 x=16/(-2) x = -8 ---------------- y = 3x+20 y = 3(-8)+20 y = -24+20 y = -4 So x = -8 and y = -4 ======================================================= # 4 y=-4x-8 y=3x+13 y=-4x-8 3x+13=-4x-8 3x+4x=-8-13 7x=-21 x=-21/7 x=-3 ----------------- y = -4x-8 y = -4(-3)-8 y = 12-8 y = 4 So x = -3 and y = 4 ======================================================= # 5 -x+y=6 y=-7+14 There's a typo in the second equation. Please repost this one. Thanks ======================================================= # 6 y=-5x+12 x+y=-3 x+y=-3 x+(-5x+12)=-3 x-5x+12=-3 x-5x=-3-12 -4x=-15 x=-15/(-4) x=15/4 ---------------- y = -5x+12 y = -5(15/4)+12 y = -75/4+12 y = -75/4+48/4 y = -27/4 So x = 15/4 and y = -27/4 ======================================================= # 7 x+y=-6 y=-3x-10 x+y=-6 x+(-3x-10)=-6 x-3x-10=-6 x-3x=-6+10 -2x=4 x=4/(-2) x = -2 ------------------ y = -3x-10 y = -3(-2)-10 y = 6-10 y = -4 So x = -2 and y = -4 ======================================================= # 8 -4x+5y=-15 4x+y=21 First we need to solve one equation for one variable. I'm going to solve the second equation for y. 4x+y=21 y=21-4x y = -4x+21 ----------- Now use substitution to solve -4x+5y=-15 -4x+5(-4x+21)=-15 -4x-20x+105=-15 -4x-20x=-15-105 -24x=-120 x=-120/(-24) x = 5 ----------- y = -4x+21 y = -4(5)+21 y = -20+21 y = 1 So x = 5 and y = 1

Equations/598236: How do you simplify 4x+x-2x+3=54? 1 solutions Answer 378559 by jim_thompson5910(28708)   on 2012-04-12 22:22:12 (Show Source): You can put this solution on YOUR website! Start with the given equation. Combine like terms on the left side. Subtract from both sides. Combine like terms on the right side. Divide both sides by to isolate . Reduce. ---------------------------------------------------------------------- Answer: So the solution is

Equations/598352: x^2 - x - 6/x^2 - 4= 1 solutions Answer 378558 by jim_thompson5910(28708)   on 2012-04-12 22:10:14 (Show Source): You can put this solution on YOUR website! So fully simplifies to In other words, for all values of x where or

Graphs/598370: solve the equation. (Enter solutions from smallest to largest. If there is no solution, enter NONE in the answer boxes.) x^2 - 5x + 5 = 0 x = x = please can some one help me, step by step 1 solutions Answer 378555 by jim_thompson5910(28708)   on 2012-04-12 22:03:15 (Show Source): You can put this solution on YOUR website! Start with the given equation. Notice that the quadratic is in the form of where , , and Let's use the quadratic formula to solve for "x": Start with the quadratic formula Plug in , , and Negate to get . Square to get . Multiply to get Subtract from to get Multiply and to get . or Break up the expression. So the solutions are or -------------------------------------------------------------------------------------------------------------- If you need more help, email me at jim_thompson5910@hotmail.com Also, please consider visiting my website: http://www.freewebs.com/jimthompson5910/home.html and making a donation. Thank you Jim --------------------------------------------------------------------------------------------------------------

Quadratic_Equations/598378: X exponent 2-x-15=o 1 solutions Answer 378554 by jim_thompson5910(28708)   on 2012-04-12 22:01:54 (Show Source): You can put this solution on YOUR website! Start with the given equation. Notice that the quadratic is in the form of where , , and Let's use the quadratic formula to solve for "x": Start with the quadratic formula Plug in , , and Negate to get . Square to get . Multiply to get Rewrite as Add to to get Multiply and to get . or Break up the expression. So the solutions are or -------------------------------------------------------------------------------------------------------------- If you need more help, email me at jim_thompson5910@hotmail.com Also, please consider visiting my website: http://www.freewebs.com/jimthompson5910/home.html and making a donation. Thank you Jim --------------------------------------------------------------------------------------------------------------

Polynomials-and-rational-expressions/598315: I need help factoring out this problem I did it in two group (20x^3+16x^2) (25x+20)=0 4x^2(5x+4) 5(5x+4)=0 (5x+4) (4x^2+5)=0 5x+4=0 5x+4-4=0-4 5x=-4 divide x= -4/5 I could not factor out (4x^2+5)=0 1 solutions Answer 378549 by jim_thompson5910(28708)   on 2012-04-12 21:19:23 (Show Source): You can put this solution on YOUR website! You are correct. You cannot factor . So you simply solve for x. Now if you haven't learned about complex/imaginary numbers yet, then you would ignore this (and the rest of the solution) and simply say that the only solution is However, if you have learned about complex/imaginary numbers, then... or So if you have learned about complex/imaginary numbers, then there are three solutions and they are , or

Numeric_Fractions/598338: 14 / N=___ when N=2 What is the work and conclusion (answer)? Thank You, Bax 1 solutions Answer 378545 by jim_thompson5910(28708)   on 2012-04-12 21:09:43 (Show Source): You can put this solution on YOUR website! 14/N = 14/2 = 7 So 14/N = 7 when N = 2

Linear-systems/598345: Find the product of the equation below ( 6 x - 5) ( 6 x + 5) 1 solutions Answer 378544 by jim_thompson5910(28708)   on 2012-04-12 21:08:43 (Show Source): You can put this solution on YOUR website! Start with the given expression. Now let's FOIL the expression. Remember, when you FOIL an expression, you follow this procedure: Multiply the First terms:. Multiply the Outer terms:. Multiply the Inner terms:. Multiply the Last terms:. --------------------------------------------------- So we have the terms: , , , Now add every term listed above to make a single expression. Now combine like terms. So FOILs to . In other words, . -------------------------------------------------------------------------------------------------------------- If you need more help, email me at jim_thompson5910@hotmail.com Also, please consider visiting my website: http://www.freewebs.com/jimthompson5910/home.html and making a donation. Thank you Jim --------------------------------------------------------------------------------------------------------------

Probability-and-statistics/597944: If a sample size of 121 is chosen then what would be the actual degrees of freedom? 1 solutions Answer 378406 by jim_thompson5910(28708)   on 2012-04-11 21:36:58 (Show Source): You can put this solution on YOUR website! If you're working with a student T distribution, then the degrees of freedom is 121-1 = 120

Probability-and-statistics/597928: A laboratory tested 71 chicken eggs and found that the mean amount of cholesterol was 230 milligrams with σ = 10.4 milligrams. construct a 95% confidence interval for the true mean cholesterol content, u, of all such eggs 1 solutions Answer 378405 by jim_thompson5910(28708)   on 2012-04-11 21:36:01 (Show Source): You can put this solution on YOUR website! ( xbar - z*sigma/sqrt(n), xbar + z*sigma/sqrt(n) ) ( 230 - 1.95996*10.4/sqrt(71), 230 + 1.95996*10.4/sqrt(71) ) ... Note: use a table or a calculator to find the value of z (227.58091, 232.419086) So the 95% confidence interval is (227.58091, 232.419086)

test/597922: 3x^2-36x+60. Can you help me solve this as a grouping polynomial. 1 solutions Answer 378399 by jim_thompson5910(28708)   on 2012-04-11 21:28:00 (Show Source): You can put this solution on YOUR website! Start with the given expression. Factor out the GCF . Now let's try to factor the inner expression --------------------------------------------------------------- Looking at the expression , we can see that the first coefficient is , the second coefficient is , and the last term is . Now multiply the first coefficient by the last term to get . Now the question is: what two whole numbers multiply to (the previous product) and add to the second coefficient ? To find these two numbers, we need to list all of the factors of (the previous product). Factors of : 1,2,4,5,10,20 -1,-2,-4,-5,-10,-20 Note: list the negative of each factor. This will allow us to find all possible combinations. These factors pair up and multiply to . 1*20 = 20 2*10 = 20 4*5 = 20 (-1)*(-20) = 20 (-2)*(-10) = 20 (-4)*(-5) = 20 Now let's add up each pair of factors to see if one pair adds to the middle coefficient : First Number Second Number Sum 1 20 1+20=21 2 10 2+10=12 4 5 4+5=9 -1 -20 -1+(-20)=-21 -2 -10 -2+(-10)=-12 -4 -5 -4+(-5)=-9 From the table, we can see that the two numbers and add to (the middle coefficient). So the two numbers and both multiply to and add to Now replace the middle term with . Remember, and add to . So this shows us that . Replace the second term with . Group the terms into two pairs. Factor out the GCF from the first group. Factor out from the second group. The goal of this step is to make the terms in the second parenthesis equal to the terms in the first parenthesis. Combine like terms. Or factor out the common term -------------------------------------------------- So then factors further to =============================================================== Answer: So completely factors to . In other words, . Note: you can check the answer by expanding to get or by graphing the original expression and the answer (the two graphs should be identical).

Money_Word_Problems/597924: In order ti start a small business, a student takes out a simple interest loan for $4000 for 9 months at a rate of 8.25%. a-) How much interest must the student pay? b-) Find the future value of the loan. 1 solutions Answer 378398 by jim_thompson5910(28708)   on 2012-04-11 21:27:00 (Show Source): You can put this solution on YOUR website! FV = PV*(1+rt) FV = 4000*(1+0.0825*(9/12)) FV = 4247.5 a) The student must pay 4247.5 - 4000 = 247.50 dollars in interest b) The future value of the loan is 4247.50 dollars.

Polynomials-and-rational-expressions/597877: I am trying to finish a problem where I am multiplying rational expressions. This is what I have simplified it down to: (c-1)*(2c+1)/(c^(2)-1). I know I must factor out (c-1) and (c^(2)-1) and the greatest common factor is (c-1). I have used algebra.com's solver and I know the answer is (2c+1)/(c+1). But how do I get (c+1) from factoring (c^(2)-1) by (c-1)? Thank you! 1 solutions Answer 378375 by jim_thompson5910(28708)   on 2012-04-11 20:10:42 (Show Source): You can put this solution on YOUR website! Start with the given expression. Rewrite as . Notice how we have a difference of squares where in this case and . So let's use the difference of squares formula to factor the expression: Start with the difference of squares formula. Plug in and . So this shows us that factors to . In other words . Hopefully this helps. If not, let me know.

sets-and-operations/597828: Let A = {5, 10, 15, 20} and B = {10, 20, 30}. What is the intersection of A and B? 1 solutions Answer 378357 by jim_thompson5910(28708)   on 2012-04-11 19:03:43 (Show Source): You can put this solution on YOUR website! A intersect B = set of all things found in both sets A and B A intersect B = {10, 20}

Volume/597829: If you have a dimensional box and it is 8 inches tall, 12 inches wide and 4 inches long. What would the volume be? 1 solutions Answer 378356 by jim_thompson5910(28708)   on 2012-04-11 19:02:55 (Show Source): You can put this solution on YOUR website! The volume would be 8*12*4 = 384 cubic inches.

Trigonometry-basics/597824: Suppose that a 16-foot ladder is leaning against a wall, making a 75 angle with the ground (as measured from a perpendicular line from the base of the ladder to the wall). How high up the wall is the end of the ladder? 1 solutions Answer 378355 by jim_thompson5910(28708)   on 2012-04-11 18:59:55 (Show Source): You can put this solution on YOUR website! sin(theta) = opposite/hypotenuse sin(75) = x/16 16*sin(75) = x x = 16*sin(75) x = 16*0.965925826289068 x = 15.4548132206251 So the ladder reaches approximately 15.4548 feet up the wall.

Polynomials-and-rational-expressions/597823: Completely factor the following expression:y^2-121z^2 show all work please 1 solutions Answer 378353 by jim_thompson5910(28708)   on 2012-04-11 18:56:58 (Show Source): You can put this solution on YOUR website! Start with the given expression. Rewrite as . Notice how we have a difference of squares where in this case and . So let's use the difference of squares formula to factor the expression: Start with the difference of squares formula. Plug in and . So this shows us that factors to . In other words .

Volume/597820: If the radius is 6 and the volume is 8595.4 cubic centimeters, how do you find the length of a cylinder? e-mail: ky_taylor2002@yahoo.com 1 solutions Answer 378352 by jim_thompson5910(28708)   on 2012-04-11 18:56:20 (Show Source): You can put this solution on YOUR website! V = pi*r^2*h 8595.4 = (3.14159)*(6)^2*h 8595.4 = (3.14159)*(36)*h 8595.4 = 113.09724*h 8595.4/113.09724 = h 76.0000862974198 = h h = 76.0000862974198 So the height (or length) of the cylinder is approximately 76.0000862974198 cm

Equations/597807: Solve : 1 solutions Answer 378348 by jim_thompson5910(28708)   on 2012-04-11 18:52:38 (Show Source): You can put this solution on YOUR website! Start with the given equation Add 2x to both sides. Rearrange the terms. Multiply every term by -1 to make the leading coefficient positive. Notice that the quadratic is in the form of where , , and Let's use the quadratic formula to solve for "x": Start with the quadratic formula Plug in , , and Negate to get . Square to get . Multiply to get Rewrite as Add to to get Multiply and to get . Simplify the square root (note: If you need help with simplifying square roots, check out this solver) or Break up the expression. or Reduce So the solutions are or

Volume/597814: The pyramid and box above have the same W, L, and H. The volume of the pyramid is 21 cm3. What is the volume of the box? 1 solutions Answer 378347 by jim_thompson5910(28708)   on 2012-04-11 18:50:20 (Show Source): You can put this solution on YOUR website! Square Pyramid: Volume = (Length*Width*Height)/3 V = (LWH)/3 21 = (LWH)/3 21*3 = LWH 63 = LWH Since the volume of a rectangular box with length, width and height of L, W, and H is V = LWH, and LWH = 63, this means that the volume of the box is 63 cubic centimeters.

Exponential-and-logarithmic-functions/597813: 9ln(7x)=45 1 solutions Answer 378346 by jim_thompson5910(28708)   on 2012-04-11 18:49:39 (Show Source): You can put this solution on YOUR website! 9ln(7x)=45 ln(7x)=45/9 ln(7x)=5 7x=e^5 x=(1/7)*e^5 x=21.20187987 So the approximate solution is x=21.20187987

Geometry_Word_Problems/597809: If 6cm is added to each side of a square, its perimeter becomes 48cm. how long is each side of the square? This is what I've done, but the answer seems wrong. Let x be one of the sides of the square. Then, 6 + x will be the rest of the sides of the square 4x + 6 + x = 48 (combine like terms) 5x + 6 = 48 (subtract 6 from both sides) 5x = 42 (divide 5 from both sides) x = 8.4 I honestly don't know. Probably the "Let's" statement I've done wrong. 1 solutions Answer 378345 by jim_thompson5910(28708)   on 2012-04-11 18:48:21 (Show Source): You can put this solution on YOUR website! Let x = original side of the square "If 6cm is added to each side of a square", then the new side length of the square is x+6 cm The perimeter is equal to 4 times the side length (since each side is equal and all sides are added up) So P = 4s. But P = 48 and s = x+6, so P = 4s 48 = 4(x+6) From here, solve for x 48 = 4x+24 48-24 = 4x 24 = 4x 24/4 = x 6 = x x = 6 So the side length of the original square is 6 cm.

Volume/597808: The pyramid and box above have the same W, L, and H. The volume of the pyramid is 21 cm3. What is the volume of the box? 1 solutions Answer 378343 by jim_thompson5910(28708)   on 2012-04-11 18:45:08 (Show Source): You can put this solution on YOUR website! Square Pyramid: Volume = (Length*Width*Height)/3 V = (LWH)/3 21 = (LWH)/3 21*3 = LWH 63 = LWH Since the volume of a rectangular box with length, width and height of L, W, and H is V = LWH, and LWH = 63, this means that the volume of the box is 63 cubic centimeters.

Probability-and-statistics/597806: An order of award presentations has been devised for 7 people: Jeff, Karen, Lyle, Maria, Norm, Olivia, and Paul... In how many ways can teh first award be presented to Karen and the last to Lyle? 1 solutions Answer 378342 by jim_thompson5910(28708)   on 2012-04-11 18:42:48 (Show Source): You can put this solution on YOUR website! Since Karen and Lyle are locked in the first and last slots, this means that there are really 7-2 = 5 free slots left. So there are 5! = 5*4*3*2*1 = 120 different ways to present the awards.

Unit_Conversion_Word_Problems/597798: A company developed a cure for a disease that inflicts 12% of the world's population (World Population is 6,600,000,000). A single dose of 1mL of cure per person is enough. If the cure is produced in 50 gallon vats, how many vats would be needed?? Thanks so much and I would like to know how to do this problem for my Exam that is coming up :) 1 solutions Answer 378339 by jim_thompson5910(28708)   on 2012-04-11 18:38:58 (Show Source): You can put this solution on YOUR website! 12% of 6.6 billion is 0.12*6.6 = 0.792 So 12% of 6.6 billion is 792 million. Therefore, 792 million people have this disease. ------------------------------------------------------- Now we need to convert 50 gallons into milliliters. It turns out that 1 gallon = 3785.41178 mL Note: this is something you either memorize or you have to look up. Multiply both sides by 50 to get 50*1 gallon = 50*3785.41178 mL 50 gallon = 189270.589 mL So 50 gallons converts to 189,270.589 mL. Round down to get 189,270 This means that one 50 gallon vat can cure 189,270 people. Now divide 792 million (7.92 x 10^8) by 189,270 (1.8927 x 10^5) to get (7.92 x 10^8)/(1.8927 x 10^5) (7.92/1.8927) x ((10^8)/(10^5)) 4.18449833571089 x 10^(8-5) 4.18449833571089 x 10^3 and then convert this answer to standard decimal notation to get 4,184.4983357108 and then round up to get the final answer of 4,185 vats

test/597795: 5x+2y=8 7x+8y=3 1 solutions Answer 378338 by jim_thompson5910(28708)   on 2012-04-11 18:29:34 (Show Source): You can put this solution on YOUR website! Start with the given system of equations: Multiply the both sides of the first equation by -4. Distribute and multiply. So we have the new system of equations: Now add the equations together. You can do this by simply adding the two left sides and the two right sides separately like this: Group like terms. Combine like terms. Simplify. Divide both sides by to isolate . Reduce. ------------------------------------------------------------------ Now go back to the first equation. Plug in . Multiply. Multiply both sides by the LCD to clear any fractions. Distribute and multiply. Add to both sides. Combine like terms on the right side. Divide both sides by to isolate . Reduce. So the solutions are and . Which form the ordered pair . This means that the system is consistent and independent.

Probability-and-statistics/597772: A bag contains 8 apples and 6 oranges. If you select 7 pieces of fruit without looking, how many ways can you get exactly 6 apples? Can you please show me how to work this problem.... I think it is 8!/6! = 56??? 1 solutions Answer 378337 by jim_thompson5910(28708)   on 2012-04-11 18:26:20 (Show Source): You can put this solution on YOUR website! If you have 7 selections, and 6 of them are taken up by apples, then the last selection must be an orange. There are 8 apples. So there are 8 C 6 = (8!)/(6!(8-6)!) = 28 ways to select 6 apples (from 8) There are 6 oranges. Since the there's only one spot for an orange, there are only 6 ways to select an orange. So multiply these results to get 28*6 = 168 This means that there are 168 ways to select exactly 6 apples.

Polynomials-and-rational-expressions/597767: What expression represents the quotient (8x^6z^4+4x^4z)/(4x^2z) 1 solutions Answer 378332 by jim_thompson5910(28708)   on 2012-04-11 18:03:13 (Show Source): You can put this solution on YOUR website! (8x^6z^4+4x^4z)/(4x^2z) (8x^6z^4)/(4x^2z)+(4x^4z)/(4x^2z) (8/4)x^(6-2)z^(4-1)+(4/4)x^(4-2)z^(1-1) 2x^4z^3+x^2z^0 2x^4z^3+x^2 So the quotient is 2x^4z^3+x^2

Average/597765: write all of the following statement(s) that apply to the following polynomial. -8x^2+7x^3+7 a) it's a trinomial b)it can not be evaluated at x=-1/3 c)it has a coefficient of 8 d) it is a cubic 1 solutions Answer 378331 by jim_thompson5910(28708)   on 2012-04-11 17:58:48 (Show Source): You can put this solution on YOUR website! a) it's a trinomial --- True, there are 3 monomial terms. b)it can not be evaluated at x=-1/3 --- False, it can be evaluated at x = -1/3 (doing so gives you 158/27) c)it has a coefficient of 8 --- False, it has a coefficient of -8 but not 8. d) it is a cubic --- True, the term with the largest exponent over the variable is x^3, which means that this is a 3rd degree polynomial (and that it's a cubic)

Reduction-of-unit-multipliers/597764: Which equation produces a line that is perpendicular to the line represented by the function below? y=2/5x+9 1 solutions Answer 378330 by jim_thompson5910(28708)   on 2012-04-11 17:55:33 (Show Source): You can put this solution on YOUR website! There are infinitely many lines that fit this description, but every perpendicular line will have a slope of -5/2. To get this slope, flip the given slope 2/5 to get 5/2 and then change the sign to get -5/2.

Probability-and-statistics/597761: A basketball player hits three-point shots 44% of the time. If she takes 4 shots during a game, what is the probability that she hits all 4 shots? 1 solutions Answer 378328 by jim_thompson5910(28708)   on 2012-04-11 17:51:13 (Show Source): You can put this solution on YOUR website! The probability of hitting all 4 shots is (0.44)^4 = 0.03748096