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Alan3354 answered: 31466 problems
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absolute-value/670950: Do we have to solve for "N"? -n-24=5-n Thank you. 1 solutions Answer 417215 by Alan3354(31487)   on 2012-10-23 20:07:47 (Show Source): You can put this solution on YOUR website! Do we have to solve for "N"? -n-24=5-n ================= I don't.

Unit_Conversion_Word_Problems/670862: Each of the four sides of a swimmimg pool measures 9 meters. The pool is 5 meters deep. How much water will be needed to fill it completely? 1 solutions Answer 417178 by Alan3354(31487)   on 2012-10-23 18:58:50 (Show Source): You can put this solution on YOUR website! Each of the four sides of a swimmimg pool measures 9 meters. The pool is 5 meters deep. How much water will be needed to fill it completely? -------------- 9*9*5 cubic meters IF it's a square. ---- If it's a 9 by 9 parallelogram, you'll have to give more info.

Word_Problems_With_Coins/670871: What is the total value of 245 ten dollar bills ? this is my other question: What is the total value of 245 hundred dollar bills? thanks please answer ASAP!! 1 solutions Answer 417173 by Alan3354(31487)   on 2012-10-23 18:52:55 (Show Source): You can put this solution on YOUR website! What is the total value of 245 ten dollar bills ? Hint: Each bill = $10 ----------------- this is my other question: What is the total value of 245 hundred dollar bills? Each bill = $100

Linear_Equations_And_Systems_Word_Problems/670873: I have a mixture system x+y=4 2x+7y=30(9) I want to sovle it by substitution. If I divide X in problem 2 by 2, would I divide 30 and 9 by 2? Or would I just divide 9 by 2? 1 solutions Answer 417169 by Alan3354(31487)   on 2012-10-23 18:48:04 (Show Source): You can put this solution on YOUR website! x+y=4 2x+7y=30(9) ------------- Is that 30*9? = 270?

Linear-systems/670879: I'm not sure if I'm in the right place but here it goes. I can't seem to figure out this problem. You have to solve for 3 variable and you're given 3 equations, but I can't solve it. The problem is: x + y + z = 0 2x + 3y + 2z = -1 x - y + z = 2 1 solutions Answer 417167 by Alan3354(31487)   on 2012-10-23 18:46:30 (Show Source): You can put this solution on YOUR website! x + y + z = 0 2x + 3y + 2z = -1 x - y + z = 2 --------------- Add eqn 1 and 3 2x + 2z = 2 --> x + z = 1 ------------- 2x + 3y + 2z = -1 x - y + z = 2 times 3 --> 3x - 3y + 3z = 6 ---- 3x - 3y + 3z = 6 2x + 3y + 2z = -1 (eqn 2) ---------------------- Add 5x + 5z = 5 --> x + z = 1 ---- Same as the 1st result --> dependent, no unique solution.

Linear-systems/670860: You are making a large triangular pennant for your school football team. The vertices of the triangle are (0,0), (0,50), and (70,20) where the coordinates are measured in inches. How many square feet of material will you need to make the pennant? 1 solutions Answer 417156 by Alan3354(31487)   on 2012-10-23 18:22:21 (Show Source): You can put this solution on YOUR website! You are making a large triangular pennant for your school football team. The vertices of the triangle are (0,0), (0,50), and (70,20) where the coordinates are measured in inches. How many square feet of material will you need to make the pennant? --------------------- 2 points are on the y-axis --> b = 50 h = 70 Area = b*h/2 = 1750 sq inches = 1750/144 sq feet ------------ That's the area of the pennant. Realistically, you have to use 50*70 sq inches and cut the pennant from it. --> 3500/144 sq ft.

Rational-functions/670850: What is the equation of the line parallel to the x-axis through the point (9,4)? Explain each step of your solution. 1 solutions Answer 417154 by Alan3354(31487)   on 2012-10-23 18:19:39 (Show Source): You can put this solution on YOUR website! What is the equation of the line parallel to the x-axis through the point (9,4)? Explain each step of your solution. ---------------- Parallel to the x-axis --> the y is constant. --> y = 4 Not many steps.

Linear-equations/670790: What is the slope of the equation 2x-9y-15 ? 1 solutions Answer 417108 by Alan3354(31487)   on 2012-10-23 16:55:16 (Show Source): You can put this solution on YOUR website! What is the slope of the equation 2x-9y-15 ? --------- There's no equal sign.

test/670784: Write the equation the square root function, shifted 7 units to the left 1 solutions Answer 417107 by Alan3354(31487)   on 2012-10-23 16:54:04 (Show Source): You can put this solution on YOUR website! Write the equation the square root function, shifted 7 units to the left -------------------- What is shifted?

Travel_Word_Problems/670779: Al drove 50 miles in 30 minutes. jill drove 30 miles in 10 minutes. which person drove faster? how fast did each person drive? 1 solutions Answer 417102 by Alan3354(31487)   on 2012-10-23 16:30:18 (Show Source): You can put this solution on YOUR website! Al drove 50 miles in 30 minutes. jill drove 30 miles in 10 minutes. which person drove faster? Al's speed = 50/30 = 5/3 mi/minute Jill's speed = 30/10 = 3 mi/minute = 9/3 mi/min Jill drove faster.

Polynomials-and-rational-expressions/670713: I need help solving this equation into the a +bi form. (-2-4i)/I Please and thank you. 1 solutions Answer 417066 by Alan3354(31487)   on 2012-10-23 14:18:06 (Show Source): You can put this solution on YOUR website! I need help solving this equation into the a +bi form. (-2-4i)/I -------------------- It's not an equation. Equations have equal signs. ------ (-2-4i)/i = (-2-4i)*i/i^2 = (-2i - 4i^2)/-1 = 2i + 4i^2 = -4 + 2i

Equations/670686: have i done this right? the equation is -2x-5=3x-21 -3x -3x -5x-5=-21 +5 +5 -5x=-27 -5x\5=-27\5 x=-5.4 1 solutions Answer 417051 by Alan3354(31487)   on 2012-10-23 13:15:21 (Show Source): You can put this solution on YOUR website! have i done this right? the equation is -2x+6 = 3x-21 6 = 5x-21 27 = 5x x = 27/5 ================= -2x-5=3x-21 *** Not -2x-5 -3x -3x -5x-5=-21 +5 +5 -5x=-27 **** You added 5 to -21, = -16 not -27 -5x\5=-27\5 x=-5.4 **** Both sides are - --> x = 5.4

Volume/670562: Find the volume of cylinder of a height 4cm whose total surface area is 484sqcm 1 solutions Answer 417045 by Alan3354(31487)   on 2012-10-23 11:35:50 (Show Source): You can put this solution on YOUR website! Find the volume of cylinder of a height 4cm whose total surface area is 484sqcm -------------- SA of a cylinder including top and bottom is Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc) Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=324.123969825909 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 7.00172163846879, -11.0017216384688. Here's your graph: --------- Ignore the -11 solution. r = 7 (very close to 7) ----------- cc Vol =~ 616 cc

Quadratic_Equations/670641: You toss a ball from 5 feet. The ball's velocity is 30 feet per second. You catch the ball at 6 feet. How long is the ball in the air? 1 solutions Answer 417043 by Alan3354(31487)   on 2012-10-23 11:23:36 (Show Source): You can put this solution on YOUR website! You toss a ball from 5 feet. The ball's velocity is 30 feet per second. You catch the ball at 6 feet. How long is the ball in the air? ----------- h(t) = -16t^2 + 30t + 5 Solve for t at h(t) = 6 feet ---- h(t) = -16t^2 + 30t + 5 = 6 -16t^2 + 30t - 1 = 0 Solved by pluggable solver: SOLVE quadratic equation (work shown, graph etc) Quadratic equation (in our case ) has the following solutons: For these solutions to exist, the discriminant should not be a negative number. First, we need to compute the discriminant : . Discriminant d=836 is greater than zero. That means that there are two solutions: . Quadratic expression can be factored: Again, the answer is: 0.0339479815749399, 1.84105201842506. Here's your graph: -------------- The 1st solution is at 6 ft on its way up. The 2nd is the total time requested. t =~ 1.841 seconds

test/670550: Why do you flip the sign of an inequality when multiply or dividing by a negative number? 1 solutions Answer 417021 by Alan3354(31487)   on 2012-10-23 09:38:30 (Show Source): You can put this solution on YOUR website! Why do you flip the sign of an inequality when multiply or dividing by a negative number? ================= It gives the correct result. ------- eg -x > 1 x < -1 -------- Another method: -x > 1 Add x 0 > x + 1 Subtract 1 -1 > x x < -1 same answer

Functions/670591: M= gs/g+s solve for s 1 solutions Answer 417017 by Alan3354(31487)   on 2012-10-23 09:28:49 (Show Source): You can put this solution on YOUR website! M= gs/g+s solve for s ------------ If you mean M= gs/(g+s) ------------ M*(g+s) = gs Mg + Ms = gs Mg = gs - Ms Mg = s*(g - M) s = Mg/(g - M)

Graphs/670599: i need help graphing the inequality 1 solutions Answer 417016 by Alan3354(31487)   on 2012-10-23 09:25:42 (Show Source): You can put this solution on YOUR website! i need help graphing the inequality ---------- Graph <= 9 is the area inside the circle, including the circle.

Graphs/670592: what is a graph 1 solutions Answer 417015 by Alan3354(31487)   on 2012-10-23 09:24:14 (Show Source): You can put this solution on YOUR website! what is a graph -------------- www.dictionary.com

Numeric_Fractions/670600: What is 6/7 divide by 4/9 as a fraction in the simplest form? 1 solutions Answer 417014 by Alan3354(31487)   on 2012-10-23 09:22:56 (Show Source): You can put this solution on YOUR website! What is 6/7 divide by 4/9 as a fraction in the simplest form? ---------- Invert the divisor and multiply. = (6/7)*(9/4)

Divisibility_and_Prime_Numbers/670604: reduce 7/13 1 solutions Answer 417013 by Alan3354(31487)   on 2012-10-23 09:21:59 (Show Source): You can put this solution on YOUR website! reduce 7/13 ------------ Can't. 7 & 13 have no common factors.

Equations/670597: How do you know if an equation has one solution or two solutions? 1 solutions Answer 417010 by Alan3354(31487)   on 2012-10-23 09:09:44 (Show Source): You can put this solution on YOUR website! How do you know if an equation has one solution or two solutions? -------------- What type of equation?

Word_Problems_With_Coins/670596: how many penniea are in 6'2 1 solutions Answer 417009 by Alan3354(31487)   on 2012-10-23 09:05:58 (Show Source): You can put this solution on YOUR website! how many penniea are in 6'2 ----------- idk

Numbers_Word_Problems/670488: What are 13 consecutive numbers whos sum is 200 1 solutions Answer 416954 by Alan3354(31487)   on 2012-10-22 23:17:45 (Show Source): You can put this solution on YOUR website! What are 13 consecutive numbers whos sum is 200 ------------ No such numbers. The sum of 13 consecutive numbers is a multiple of 13.

test/670474: b=y-mx My y = 1347 My x = 5 Please help! 1 solutions Answer 416949 by Alan3354(31487)   on 2012-10-22 23:03:49 (Show Source): You can put this solution on YOUR website! b=y-mx My y = 1347 My x = 5 Please help! ===================== What do you want to do?

Complex_Numbers/670501: I have been given this question, can you help me out.Find all roots of the equation z5 = i, i.e. find the five values of i^(1/5)and show them on an Argand diagram. 1 solutions Answer 416948 by Alan3354(31487)   on 2012-10-22 23:00:59 (Show Source): You can put this solution on YOUR website! duplicate

Complex_Numbers/670502: I have been given this question, can you help me out.Find all roots of the equation z^5 = i, i.e. find the five values of i^(1/5)and show them on an Argand diagram. 1 solutions Answer 416947 by Alan3354(31487)   on 2012-10-22 23:00:24 (Show Source): You can put this solution on YOUR website! I have been given this question, can you help me out.Find all roots of the equation z^5 = i, i.e. find the five values of i^(1/5)and show them on an Argand diagram. ------------- i = cis(90) + n*360 --> cis(18) = cos(18) + i*sin(18) cis(90) = i cis(162) cis(234) cis(306) ---------- You'll have to make the diagram.

Complex_Numbers/670439: I am taking college Algebra this year and I forgot how to solve this problem may you please help me. The problem is this: 7/8+i. In the instructions it says that I have to write it in the form A+Bi 1 solutions Answer 416940 by Alan3354(31487)   on 2012-10-22 21:58:08 (Show Source): You can put this solution on YOUR website! 7/8+i ------- If you mean 7/8 + i, it's done. If you mean 7/(8+i) Multiply NUM and DEN by the conjugate of the DEN, 8-i ---- = 7(8-i)/(64-i^2) = (56 - 7i)/65 = 56/65 - 7i/65

Equations/670455: what is the slope and y-intercept for 5x-2y=-4? 1 solutions Answer 416929 by Alan3354(31487)   on 2012-10-22 21:08:40 (Show Source): You can put this solution on YOUR website! what is the slope and y-intercept for 5x-2y=-4? ---------- Solve for y

Polynomials-and-rational-expressions/670437: 3b2-16b+16 can anyone show me how to work this problem? 1 solutions Answer 416928 by Alan3354(31487)   on 2012-10-22 21:07:42 (Show Source): You can put this solution on YOUR website! 3b2-16b+16 can anyone show me how to work this problem? ------------ Step 1, what do you want to do?

Triangles/670371: the measure of the angles of a triangle are in the ratio 1:3:5 the smallest angle in degrees is 1 solutions Answer 416921 by Alan3354(31487)   on 2012-10-22 20:32:23 (Show Source): You can put this solution on YOUR website! the measure of the angles of a triangle are in the ratio 1:3:5 the smallest angle in degrees is ------------- 1x + 3x + 5x = 180 degrees

Money_Word_Problems/670412: How much each year would you have to put into a savings account, paying 7% interest, so that in 30 years when you retire you will have $1,000,000? 1 solutions Answer 416919 by Alan3354(31487)   on 2012-10-22 20:29:23 (Show Source): You can put this solution on YOUR website! How much each year would you have to put into a savings account, paying 7% interest, so that in 30 years when you retire you will have $1,000,000? -------------- How often is it compounded?