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# Recent problems solved by 'Alan3354'

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 Expressions-with-variables/677858: I had to solve this two-step equation: 2n - 5 = 7 Here's my work: 2n - 5 = 7 2n - 5 - 5 = 7 - 5 2n = 2 2n ÷ 2 = 2 ÷ 2 n = 1 But on the answer sheet it says my answer is supposed to be -10! Can anyone tell me what I'm doing wrong?1 solutions Answer 421094 by Alan3354(30993)   on 2012-11-08 16:21:49 (Show Source): You can put this solution on YOUR website!I had to solve this two-step equation: 2n - 5 = 7 Here's my work: 2n - 5 = 7 2n - 5 - 5 = 7 - 5 ************* Add 5 here, not subtract 2n = 2 2n ÷ 2 = 2 ÷ 2 n = 1 But on the answer sheet it says my answer is supposed to be -10! Can anyone tell me what I'm doing wrong? ------------------------------------ 2n - 5 = 7 2n = 12 n = 6 ----------- It's not -10
 Polynomials-and-rational-expressions/677857: How do you solve the quadratic equation 49x to the 2nd power=25?1 solutions Answer 421093 by Alan3354(30993)   on 2012-11-08 16:16:11 (Show Source): You can put this solution on YOUR website!How do you solve the quadratic equation 49x to the 2nd power=25? ============ Get the square root of both sides.
 Equations/677856: Need help getting y by itself? 2x-3y=9 x+2y-4=0 3x+4y=12 im not sure wether i need to simplfy them or leave them as they are, please help me, thank you1 solutions Answer 421092 by Alan3354(30993)   on 2012-11-08 16:14:30 (Show Source): You can put this solution on YOUR website!Need help getting y by itself? 2x-3y=9 x+2y-4=0 3x+4y=12 im not sure wether i need to simplfy them or leave them as they are, please help me, thank you ---------------------- "getting y by itself" means getting it on one side of the equal sign. Do what it take to do that. ---- 2x-3y=9 Add 3y to both sides. Divide by 3. ====================== x+2y-4=0 Add 4 subtract x divide by 2 ==================== 3x+4y=12 similar to the 2 above.
 test/677844: Evaluate: y^y - 5y if y=-31 solutions Answer 421088 by Alan3354(30993)   on 2012-11-08 15:55:18 (Show Source): You can put this solution on YOUR website!Evaluate: y^y - 5y if y=-3 ------------ Sub -3 for y, see what you get.
 Quadratic_Equations/677837: From the following list of equations, decide which are quadratic and explain your choices. a. b. c. 1 solutions Answer 421087 by Alan3354(30993)   on 2012-11-08 15:54:22 (Show Source): You can put this solution on YOUR website!They're all quadratic. They all have x^2, x to the power of 2.
 test/677831: Whats angle b if angle a is 70 degrees and angle c is 45 degrees. It's a triangle1 solutions Answer 421085 by Alan3354(30993)   on 2012-11-08 15:50:00 (Show Source): You can put this solution on YOUR website!Whats angle b if angle a is 70 degrees and angle c is 45 degrees. It's a triangle --------------- Hint: A + B + C = 180 degrees
 Exponents/677840: how do you work out the problem n/12=61 solutions Answer 421083 by Alan3354(30993)   on 2012-11-08 15:48:44 (Show Source): You can put this solution on YOUR website!how do you work out the problem n/12=6 --------- Step 1, say what you want to do. "work out the problem" is not descriptive.
 Equations/677807: Hi I need to know how to solve 3 1/9 + n = 3 1/41 solutions Answer 421081 by Alan3354(30993)   on 2012-11-08 15:40:40 (Show Source): You can put this solution on YOUR website!Hi I need to know how to solve 3 1/9 + n = 3 1/4 -------------- Subtract 3 from both sides. then subtract 1/9 from both sides.
 Exponents/677830: i'm having a hard time with this question simplify (y^x times y^-x)^41 solutions Answer 421080 by Alan3354(30993)   on 2012-11-08 15:39:29 (Show Source): You can put this solution on YOUR website!simplify (y^x times y^-x)^4 --------- Multiply --> add exponents.
 Numbers_Word_Problems/677775: how do you solve three less than a four times a number is 29?1 solutions Answer 421079 by Alan3354(30993)   on 2012-11-08 15:37:44 (Show Source): You can put this solution on YOUR website!how do you solve three less than a four times a number is 29? ----------- I would use a symbol for "a number," probably n. Then, 4 times that is 4n 3 less is 4n - 3 etc
 test/677829: Find the measure of angle B if angle a is 70 degrees and angle c is 45 degrees. What's angle b?1 solutions Answer 421077 by Alan3354(30993)   on 2012-11-08 15:35:58 (Show Source): You can put this solution on YOUR website!Find the measure of angle B if angle a is 70 degrees and angle c is 45 degrees. What's angle b? ------------- Not enough info. How are the angles related? Are they in a polygon? Are they just randomly placed in a plane, or in 3-space?
 Equations/677744: 4^7x = 7000 1 solutions Answer 421071 by Alan3354(30993)   on 2012-11-08 15:16:11 (Show Source): You can put this solution on YOUR website!4^7x = 7000 ---------------- Assuming 7x is the exponent: 7x*log(4) = log(7000) x = log(7000)/(7*log(4)) x =~ 0.912367
 Equations/677788: -40=5(2a-1)^3 Does the exponent belong with the 5 as well as the (21-1)?1 solutions Answer 421063 by Alan3354(30993)   on 2012-11-08 15:04:56 (Show Source): You can put this solution on YOUR website!-40=5(2a-1)^3 Does the exponent belong with the 5 as well as the (21-1)? ----------- The exponent is applied to what's in the parentheses, nothing else.
 Expressions-with-variables/677803: 6t + 2 - 4t How would I simplify this expression?1 solutions Answer 421060 by Alan3354(30993)   on 2012-11-08 15:01:32 (Show Source): You can put this solution on YOUR website!6t + 2 - 4t How would I simplify this expression? ------------ Combine the 2 t terms.
 Radicals/677621: Got a problem I need help with: 6/4 - Sqrt of x Thanks in advance.1 solutions Answer 420963 by Alan3354(30993)   on 2012-11-08 08:35:29 (Show Source): You can put this solution on YOUR website!Got a problem I need help with: 6/4 - Sqrt of x ------------- 1. What is the denominator? 4? or 4 - sqrt(x) ? 2. What do you want to do?
 Travel_Word_Problems/677623: a car travels at an average speed of 68 miles per hour. how many miles does it travel in 4 hour and 45 minutes. 1 solutions Answer 420962 by Alan3354(30993)   on 2012-11-08 08:25:47 (Show Source): You can put this solution on YOUR website!a car travels at an average speed of 68 miles per hour. how many miles does it travel in 4 hour and 45 minutes. ---------- 4 hr 45' = 4.75 hours d = r*t
 Systems-of-equations/677531: hello I need help doing this system since I keep getting the wrong answer... thank you in advance! xy-x^2=-20 x-2y=31 solutions Answer 420927 by Alan3354(30993)   on 2012-11-07 23:18:10 (Show Source): You can put this solution on YOUR website!xy-x^2=-20 x-2y=3 --> y = (x-3)/2 --------- xy-x^2=-20 Sub for y (x+8)*(x-5) = 0 x = -8, y = -5.5 x = 5, y = 1
 Travel_Word_Problems/677480: A ball is thrown vertically upward. After t seconds, its height h (in feet) is given by the function h(t)=80t+16t^2 . What is the maximum height that the ball will reach? Do not round your answer. Height= ? feet1 solutions Answer 420894 by Alan3354(30993)   on 2012-11-07 21:08:50 (Show Source): You can put this solution on YOUR website!A ball is thrown vertically upward. After t seconds, its height h (in feet) is given by the function h(t)=80t+16t^2 . What is the maximum height that the ball will reach? -------------- h(t) increases with t, there's no max. It goes up, never comes down.
 Rectangles/677470: Find the dimensions that give the largest area for the rectangle. Its base is on the x-axis and its other two vertices are above the x-axis, lying on the parabola y=8-x^21 solutions Answer 420892 by Alan3354(30993)   on 2012-11-07 21:05:02 (Show Source): You can put this solution on YOUR website!Find the dimensions that give the largest area for the rectangle. Its base is on the x-axis and its other two vertices are above the x-axis, lying on the parabola y=8-x^2 ------------- It's symmetrical about the y-axis, so find the max area on the + side. Area = x*y = x*(8-x^2) = 8x - x^3 dA/dx = 8 - 3x^2 = 0 x = sqrt(8/3) = 2sqrt(6)/3 --> y = 16/3 ------------ Whole rectangle is 4sqrt(6)/3 by 16/3
 Pythagorean-theorem/677469: how do i do 45 -45-90 theorem with 6*sq root of 2 what is the answer 1 solutions Answer 420890 by Alan3354(30993)   on 2012-11-07 20:55:35 (Show Source): You can put this solution on YOUR website!how do i do 45 -45-90 theorem with 6*sq root of 2 what is the answer ------------ What is the question? Define "do"
 Travel_Word_Problems/677440: If Michael rides his bike 3.5 miles, how many yards did he ride his bike?1 solutions Answer 420873 by Alan3354(30993)   on 2012-11-07 20:09:25 (Show Source): You can put this solution on YOUR website!If Michael rides his bike 3.5 miles, how many yards did he ride his bike? ----------- 1 mile = 1760 yards ------ 1 mile = 8 furlongs 1 mile = 320 chains --------- Metric, anyone?
 Exponents/677451: what is the easiest way to do a problem like this: Write 9950 as a product of prime numbers1 solutions Answer 420872 by Alan3354(30993)   on 2012-11-07 20:06:10 (Show Source): You can put this solution on YOUR website!what is the easiest way to do a problem like this: Write 9950 as a product of prime numbers --------------- 9950 = 2*5*5*199
 Exponents-negative-and-fractional/677206: Can someone check my work please? I feel like I'm missing steps. I'm not sure if I'm on the right track with this one. Thank you! [3y^(2/3)]^(-3) (3y(2/3))^-3 = (6y/3)^-3 = (2y)^-3 = 2^-3y^-3 = 1/(2^3y^3)=1/8y^31 solutions Answer 420747 by Alan3354(30993)   on 2012-11-07 14:20:54 (Show Source): You can put this solution on YOUR website![3y^(2/3)]^(-3) = = =
 Age_Word_Problems/677209: when i am 2 years old and my sister is half of my age how old is she when i am 1001 solutions Answer 420746 by Alan3354(30993)   on 2012-11-07 14:17:38 (Show Source): You can put this solution on YOUR website!when i am 2 years old and my sister is half of my age how old is she when i am 100 ------------- She will always be 1 yr younger (as long as you're both living).
 Travel_Word_Problems/677115: If the lake is 60 miles and im driving at 40 miles per hour the entire time, how long will it take me to get to the lake?1 solutions Answer 420699 by Alan3354(30993)   on 2012-11-07 11:35:53 (Show Source): You can put this solution on YOUR website!If the lake is 60 miles and im driving at 40 miles per hour the entire time, how long will it take me to get to the lake? ------------- d = r*t t = d/r
 Numbers_Word_Problems/677133: Simple price asking problem. Is my set up for, "The price of a car with 18% discount is \$19,680. What was the original price of the car? I wrote it as 18% x 19,680 = Is this the correct set up? Percentage times the price? 1 solutions Answer 420698 by Alan3354(30993)   on 2012-11-07 11:31:47 (Show Source): You can put this solution on YOUR website!Simple price asking problem. Is my set up for, "The price of a car with 18% discount is \$19,680. What was the original price of the car? --------------------------- Price - 18% = Price*82% = 0.82*Price ---- 0.82*Price = 19680 Price = 19680/0.82 Price = \$24000
 Proportions/677062: What is the ratio of 48/40?1 solutions Answer 420664 by Alan3354(30993)   on 2012-11-07 08:38:10 (Show Source): You can put this solution on YOUR website!What is the ratio of 48/40? -------------- = 48:40 or 6:5 -------- = 1.2:1
 Travel_Word_Problems/677037: what must be the speed of the boat to cover the same distance in a shorter time of 20 minutes?1 solutions Answer 420662 by Alan3354(30993)   on 2012-11-07 08:35:43 (Show Source): You can put this solution on YOUR website!what must be the speed of the boat to cover the same distance in a shorter time of 20 minutes? -------------- It will have to go faster.
 test/677056: algebra topics with examples 1 solutions Answer 420654 by Alan3354(30993)   on 2012-11-07 07:27:01 (Show Source): You can put this solution on YOUR website!algebra topics with examples ------------ Look at the solved problems.
 Linear-equations/671915: Can someone help me graph this equation.. 3x-4y>121 solutions Answer 420619 by Alan3354(30993)   on 2012-11-06 20:53:52 (Show Source): You can put this solution on YOUR website!Can someone help me graph this equation.. 3x-4y>12 -------------- There's no equal sign, so it's not an equation. It's an inequality.
 Rectangles/676834: The perimeter of a rectangle is 152cm. The width is 35cm. Find the length. 1 solutions Answer 420618 by Alan3354(30993)   on 2012-11-06 20:51:38 (Show Source): You can put this solution on YOUR website!The perimeter of a rectangle is 152cm. The width is 35cm. Find the length. -------------- P = 2W + 2L 152 = 2*35 + 2L = 70 + 2L 2L = 82 L = 41 cm