# Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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 Algebra: Expressions involving variables, substitution Solvers Lessons Answers archive Quiz In Depth

 Question 260421: Hi! I need help on how to divide this question please. x^2+3x-54 BY x+9 This is the first time I have used this website, so I hope you understand how I wrote out the problem. Thank you Click here to see answer by richwmiller(9135)

 Question 260452: simplify by removing factors of 1. s^2 -4 over (x+2)^2 What is the simplified form? Click here to see answer by stanbon(57327)
 Question 260452: simplify by removing factors of 1. s^2 -4 over (x+2)^2 What is the simplified form? Click here to see answer by richwmiller(9135)

 Question 260428: Find all number for which the rational expression is undefined. 1 over y-6 Click here to see answer by checkley77(12569)

 Question 260683: In the expression below, b is called the _____, and n is called the exponent. Click here to see answer by Fombitz(13828)
 Question 260683: In the expression below, b is called the _____, and n is called the exponent. Click here to see answer by richwmiller(9135)

 Question 260747: The first person shovels 10 square feet per minute, while the second person shovels 8 square feet per minute. write and simplify an expression that gives the total square feet that the two people shovel in x minutes. Click here to see answer by richwmiller(9135)

 Question 260938: solve this system with substitution y=3x+1 and x=3y+1 I don't get it at all and if you could help me out it'd be great:) Click here to see answer by richwmiller(9135)

 Question 261027: in my math book is says find a value of n that makes the expression divisible by 2,3,5. so would 18n would be divisible by 2,3,or5. Click here to see answer by Greenfinch(383)

 Question 260976: A six passenger plane cruises at 180mph in calm air. If the plane flies 7 miles with the wind in the same amount of time as it flies 5 miles against the wind then what is the speed? T = D/R Click here to see answer by checkley77(12569)

 Question 261305: 3. The town of Elena is 24 mi north and 8 mi west of Holberg. A train runs on a straight track between the two towns. How many miles does it cover? Round your answer to the nearest whole number. a. 17 mi b. 33 mi c. 40 mi d. 25 mi Click here to see answer by CharlesG2(828)

 Question 262265: How do you solve systems using elimination?For example x+2y=1 x-y=-5 Click here to see answer by Alan3354(30993)

 Question 262003: Find a two-decimal-place number between 0 and 1 such that the sum of its digits is 9 and such that if the digits are reversed the number is increased by .27. Click here to see answer by ankor@dixie-net.com(15649)

 Question 262455: I am trying to help my niece with her homework and I need step-by-step instructions on how to use substitution to solve a system of equations. Example: 2x + 3y = 5 4x - 9y = 9 Thanks for any help that you can share!! Click here to see answer by stanbon(57327)
 Question 262455: I am trying to help my niece with her homework and I need step-by-step instructions on how to use substitution to solve a system of equations. Example: 2x + 3y = 5 4x - 9y = 9 Thanks for any help that you can share!! Click here to see answer by scott8148(6628)
 Question 262455: I am trying to help my niece with her homework and I need step-by-step instructions on how to use substitution to solve a system of equations. Example: 2x + 3y = 5 4x - 9y = 9 Thanks for any help that you can share!! Click here to see answer by Edwin McCravy(8908)
 Question 262455: I am trying to help my niece with her homework and I need step-by-step instructions on how to use substitution to solve a system of equations. Example: 2x + 3y = 5 4x - 9y = 9 Thanks for any help that you can share!! Click here to see answer by richwmiller(9135)

 Question 262535: ned help on algebra involving substitution x=y+4 -x+2y=7 Click here to see answer by drk(1908)
 Question 262535: ned help on algebra involving substitution x=y+4 -x+2y=7 Click here to see answer by dabanfield(803)

 Question 262647: If twice a number is subtracted from 8, the difference is 12. What is the number? My attempt was: 2x-8=12 but then I realized I wasn't subtracting from 8 I was subtracting 8 from 2x. Click here to see answer by unlockmath(1599)

 Question 262632: Directions: Define a variable and write an equation. Then solve. If twice a number is subtracted from 8, the difference is 12. What is the number? Click here to see answer by shiela mae(5)

 Question 262796: Hello, we are learning the substitution method of solving systems of equations. My equations are 4x + 5y = -6 and 2x - 10/3y = -4. I have tried it several different ways, and once got (-6,18/5) and another time (0,6/5), neither of which is correct. Please show the steps so I can find my error. Thanks!! Click here to see answer by drk(1908)

 Question 263014: The sales representative informs you that there are 38 homes available which combined floor plans 1 and 2. Floor plan 1 sells for 175,000 and floor plan sells for 200,000. The combined cost for all the homes is 7,200,000. How many of each plan are available? Click here to see answer by richwmiller(9135)

 Question 263013: A cellular phone company offers a contract for which the cost C, in dollars, of t minutes of telephoning is given by C=0.25(t-400)+43.95, where it is assumed that t is greater than or equal to 400 minutes. What times will keep costs between \$87.70 and \$123.95? Click here to see answer by richwmiller(9135)

 Question 263029: Two angles are compementary. The sum of the measure of the first angle and one-fourth the second angle is 66degrees. Find the measures of the angles. What is the measure of the smaller angle? What is the measure of the other angle? Click here to see answer by stanbon(57327)

 Question 263066: I need step-by-step instructions on how to solve systems of equations by elimination. for ex. 2x + 5y = -22 4x - 3y = 8 also i need to know if youh graph this one or not -4y +7c = -8 10x + 4y =8 if not why and if yes then how pease help me im very confused. Click here to see answer by ankor@dixie-net.com(15649)

 Question 263148: This one is a application problem. I am unsure what formula to use to solve. It reads: A carpenter purchased 60ft of redwood and 80ft of pine for a total cost of \$286. A second purchase, at the same price, included 100ft of redwood and 60ft of pine for a total cost of \$396. Find the cost per foot of redwood and of pine. Click here to see answer by drk(1908)

 Question 263223: The kinetic Energy (K) of a moving object varies jointly with its mass (m) and the square of its velocity (v). If an object weighing 90 kilograms and moving with a velocity of 20 meters per second has a kinetic energy of 4500 Joules, find its kinetic energy when the velocity is 32 meters per second. Click here to see answer by ankor@dixie-net.com(15649)

 Question 263332: A bank offers two checking plans. The Anywhere plan charges 25 cents per check. The AccuCheck plan costs \$0.80 a month, plus 15 cents per check. For what number of checks will the AccuCheck plan cost less than the Anywhere plan? Click here to see answer by richwmiller(9135)

 Question 263335: The perimeter of a rectangle is 166 m. The length is 8 m more than twice the width. What is the length? What is the width? Click here to see answer by mananth(12270)
 Question 263335: The perimeter of a rectangle is 166 m. The length is 8 m more than twice the width. What is the length? What is the width? Click here to see answer by stanbon(57327)

 Question 263342: Solve by the elimination method. 2x - 4y = 3 2x - 4y = 4 What is the solution of the system? Click here to see answer by checkley77(12569)

 Question 263341: S.L. lumber can convert logs into either lumber of plywood. In a given day the mill turns out 3 times as many units of plywood as lumber. It makes a profit of \$20 on a unit of lumber and \$50 on a unit of plywood. How many of each must be produced to make a profit of \$17340?!! Click here to see answer by richwmiller(9135)