# 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 513254: Write an expression for the following. After a 20% discount, an item was sold for \$9600. What was the original price of the item? this is what I tried.... p=original price 9600=p-20% 9600(.2) 9600=p-1920 +1920 +1920 11520=p Click here to see answer by solver91311(16872)

 Question 513353: how do i solve this: 5.6 equal 1.1p+1.2 Click here to see answer by solver91311(16872)

 Question 513355: Forty students bought caps at the baseball game. Plain caps cost \$4 each and deluxe ones cost \$6 each. If the total bill was \$236, how many students bought the deluxe cap? Click here to see answer by solver91311(16872)
 Question 513355: Forty students bought caps at the baseball game. Plain caps cost \$4 each and deluxe ones cost \$6 each. If the total bill was \$236, how many students bought the deluxe cap? Click here to see answer by oberobic(2304)

 Question 513461: solve for a in terms of b when 2b=3(a-4) Click here to see answer by umail08(87)

 Question 513751: I am trying to help a friend with an algebra problem and am coming out with one answer, she's getting a 2nd and some computer thing at her school says a 3rd which neither of us can figure out. Here is the equation: 6{[3(n-15)+18]-[2(3n-3)+5]}. I'm getting -18n-156 as an answer. She is getting -18n+12 and the computer program at her school says -18n+24. HELP!! Thanks so much!! Click here to see answer by Alan3354(30993)

 Question 514247: y ≤ ax+b when (a<0) Solve for x. Click here to see answer by lwsshak3(6490)

 Question 514674: what is the varible, n, in this equation? -n-24=5-n Click here to see answer by stanbon(57282)

 Question 515165: if the number of words that a word processing student can type in one minute is represented by the formulae W=35m+12 where m is the number of minutes and W is the number of words, how long would it take a student to type a 3000 word essay? I think that they have made a mistake in the question because It does not make sense I think it is an error and meant to go M = 35w + 12. Can you please help me work out this equation. Click here to see answer by nerdybill(6951)

 Question 515122: Each person in the us produces 3.5 pounds of trash each day. write an expression to describe the pounds of trash produced per day by a family with (m) member. Click here to see answer by Alan3354(30993)

 Question 515425: Could you please show work on how you get the answer for: One number is 4 less than 3 times another. Their sum is -16. Find the smaller. Click here to see answer by oberobic(2304)

 Question 515394: I need to find the domain of the function I just cant get it right ^ means to the second power p(x)=x^ -2x+7 Click here to see answer by oberobic(2304)

 Question 515509: Hi..trying to help my son on his homework, and running into a bit of a wall on this one. I can intuit my way to the correct answer, but can't show how to get there algebraically. "Samantha invested her \$10,000 savings at two different banks for one year. She put part of the money in Bank A which paid 8% interest. The rest of the money was invested at 7% at Bank B.At the end of the year she had accumulated \$735 in interest. How much money did she invest at Bank A? Hint:7% interest on an unknown amount of money is .07n." I can get the answer (6500\$ at 7%, %3500 at 8%), but I can't see how to write out the equation. Any help you can provide would be greatly appreciated, as we've spent three hours on this assignment already! :) Thank you again, we both greatly appreciate any time you give us!!! -greg and gabe scott Click here to see answer by stanbon(57282)
 Question 515509: Hi..trying to help my son on his homework, and running into a bit of a wall on this one. I can intuit my way to the correct answer, but can't show how to get there algebraically. "Samantha invested her \$10,000 savings at two different banks for one year. She put part of the money in Bank A which paid 8% interest. The rest of the money was invested at 7% at Bank B.At the end of the year she had accumulated \$735 in interest. How much money did she invest at Bank A? Hint:7% interest on an unknown amount of money is .07n." I can get the answer (6500\$ at 7%, %3500 at 8%), but I can't see how to write out the equation. Any help you can provide would be greatly appreciated, as we've spent three hours on this assignment already! :) Thank you again, we both greatly appreciate any time you give us!!! -greg and gabe scott Click here to see answer by drcole(72)

 Question 515580: Write in slope-intercept form. y=mx+b Through (1,2), parallel to y=5 Click here to see answer by oberobic(2304)

 Question 515595: A doll was sold for \$45 at a loss of 10%. What was the original price? Original Price has to be greater than 45 since it was sold at a loss, so: Loss was only 10%, so there was a 'gain' of 90%, for want of a better term. So 90% of some number gives a loss of 45. 0.9(some number) = 45 some number = some number = 50 I'm not really comfortable with this method. Could I be, kindly, shown alternatives? Click here to see answer by drcole(72)

 Question 515719: Solve the equation for y. Then find the value for y for each value x. 4x=3y-7; x= a, 5, 6 Click here to see answer by Maths68(1474)

 Question 515722: Solve the equation for y. Then find the value for y for each value x. 6x=7-4y; x= -2, -1, 0 Click here to see answer by Maths68(1474)

 Question 515716: solve for x ax-x=c Here is what I've come up with... x=c/a-1 Is this correct? Click here to see answer by Maths68(1474)

 Question 515720: Solve the equation for y. Then find the value for y for each value x. 2y+7x=4; x= 5, 10, 15 Click here to see answer by tracyc0912(40)

 Question 515862: 1/4 + 2/5 x + 1= 2 1/4 ( One fourth plus two fifths times "variable x" plus one equals two and one fourth solve for "x") Click here to see answer by Alan3354(30993)

 Question 516666: Under what circumstances would I need to use algebraic expressions, equations, and formulas? Why are they so confusing? Click here to see answer by solver91311(16872)

 Question 516884: Solve the equation for the variable: x^2+2x =63 Click here to see answer by faceoff57(82)

 Question 517264: Help me with simplifying : 3x - 2 = 42 ? Click here to see answer by lattemail(1)

 Question 517345: Ben was hired to shovel 100 tons of caol. He has been shoveling coal at the rate of 16 tons per day. After 3 days his brother char joins him so they can finish the job faster. Char can shovel 10 tons per day. The Question is: Find the amount of the 100 tons shoveled by each brother and the amount of time each brother works shoveling coal? Click here to see answer by ankor@dixie-net.com(15645)

 Question 517727: Three consecutive integers such that the sum of the smallest and three times the largest is 66 ??? Click here to see answer by richwmiller(9135)

 Question 517815: how do i solve for: 7a,for a = 465 Click here to see answer by richwmiller(9135)

 Question 517820: x^3=-3x^2+10x So, I don't know if I'm doing this right... -3x^2+10x-x^3=0 x(-x^2-3x+10)=0 x(-x-2)(-x-5) -x-2=0 -x-5=0 The -x doesn't seem right...is it? Click here to see answer by stanbon(57282)

 Question 517840: Is it possible to solve 9n-7=5n+5 if so how? Click here to see answer by stanbon(57282)

 Question 517951: if a rectangular table with an area of 35sq ft has a width that is 2 ft less than the length what are the dimensions of the table. I think it is written 2(l x l-2)=35 let me know if I doing this right and I need help with steps Click here to see answer by checkley77(12569)