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

Algebra ->  Algebra  -> Expressions-with-variables -> Questions on Algebra: Expressions involving variables, substitution answered by real tutors!      Log On

 Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help! Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!

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

 Question 629323: (x – 3) (2x – 5) – (x + 1) (x – 6) = Can you please show me your work – I am having difficulty understanding this part of algebra. Thank you Click here to see answer by lwsshak3(6514)

 Question 629443: Emily rows 6 miles down stream in 1 hour and her friend Ashley,rowing 1 mile per hour faster, completes the return trip in 2 hours. Find the speed of the current (c)andeach girl's rowing speed Show all work please Thanks Click here to see answer by dfrazzetto(277)

 Question 629722: Sammy bought DVDs and CDs. She spent the same amount of money on both. If DVDs cost \$16 and CDs cost \$12, what is the least she could have spent total? Click here to see answer by ewatrrr(10682)
 Question 629722: Sammy bought DVDs and CDs. She spent the same amount of money on both. If DVDs cost \$16 and CDs cost \$12, what is the least she could have spent total? Click here to see answer by josmiceli(9693)

 Question 629721: Jake and Snake have a 360 day membership to a badminton club. Jake will use it every other day. Snake will use it every third day. They both use the club on day one. How many days total out of 360 will at least one of them use the club? Click here to see answer by josmiceli(9693)

 Question 629927: Simplify the expression 21-7*2+9 Show your work. Then, show how the solution is affected if addition and subtraction are not applied from left to right. Click here to see answer by nerdybill(6962)

 Question 630072: h(t)= -16t^2+dt+c At time t=0, a rocket was launched upward from an initial height of 6 feet. Until the rocket hit the ground, its height, in feet, after t seconds was given by the function h aobve, in which c and d are positive constants. If the rocket reached its maximum height of 350 ft at time t=4, what was the height, in feet, of the rocket at time t=1? (the answer is 140, by the way) please include explanations! Click here to see answer by stanbon(57377)

 Question 630392: Q: A skydiver who jumps from a plane gains speed while falling. For one jump, altitude readings were made every ten seconds until the parachute opened. Known data includes: Started at altitude of 500 meters; drops 70 meters every 10 seconds. I need to write an algebraic equation to represent the data showing the altitude at 65 seconds. I have already done the graph, analyzed the information and determined the altitude would be 45 meters at the 65 second mark. I have tried multiple formulas to represent the facts but in proving my equations, they are incorrect. I need to write this data in an algebraic equation, can you help? Thanks (in advance) Click here to see answer by Alan3354(30993)

 Question 630733: rewrite the following in the form y=mx+b 2x-y=4 3x+5y=9 Click here to see answer by rmnavalta(7)

 Question 630739: translate the algebraic expression the product of -10 and the difference between c and 1 Click here to see answer by reviewermath(529)

 Question 630859: Find all values for which x-5/x-3 is undefined. Click here to see answer by Alan3354(30993)

 Question 630850: Please help me with this question. Thank you 3. y varies jointly as a and b, and inversely as the square root of c. y=140 when a=10, b=7 and c=36. find y when a=7, b=4, and x=16. Click here to see answer by stanbon(57377)

 Question 630977: Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. -6x - 12y = -3 2x + 4y = 0 Click here to see answer by ewatrrr(10682)

 Question 631148: Solve the system of equations using the elimination method. a+8b = 9 a+3b=-1 Click here to see answer by ewatrrr(10682)

 Question 631127: Please show me how to find the LCD for: x-3/x^2-x and 2x+7/3x-3 I know you have to factor, but I can't figure it out. Click here to see answer by ewatrrr(10682)

 Question 631622: I need some guidance on this word problem please. I need to find how a population grows over seven months. r: remains constant. For the first month I have 10 rabbits and end with 15, which is a larger number that depends on r ( the intrinsic rate of growth). The beginning of the second time step starts with the number at the end of the previous step. Round to the nearest whole number.At the end of 7 months, how large did the population become? Thank you , Ann Click here to see answer by mananth(12270)

 Question 631645: Find the slope intercept form for the line satisfying the following conditions x-intercept 2 y-intercept 4/5 The answer I got was -4/5 is this correct? Click here to see answer by Maths68(1474)
 Question 631645: Find the slope intercept form for the line satisfying the following conditions x-intercept 2 y-intercept 4/5 The answer I got was -4/5 is this correct? Click here to see answer by reviewermath(529)

 Question 632663: Can you help me simplify this expression : (3/4)Y+8Y-1.4Y+(4/5)-(9/2) Click here to see answer by stanbon(57377)

 Question 632866: Solve the following system algebraically: What I have tried: -> ; -> -> ; -> -> i multiplied every thing by 2 and got -> -> i multiplied every thing by 5 and got -> -> -> -> i plugged this number into the third top equation and got x=150, and plugged z and x into the second equation and got y=18. But when i plug these numbers into the first equation, the answer is wrong. I cannot figure out what I am doing wrong? Click here to see answer by ewatrrr(10682)