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

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 340211: .105x+.06(20000-x)=1740

Click here to see answer by rfer(12657)

Question 340245: How do you write a numerical or algebraic expression for this problem? The number in cents of n nickels.
Click here to see answer by fractalier(2101)

Question 340245: How do you write a numerical or algebraic expression for this problem? The number in cents of n nickels.
Click here to see answer by stanbon(57290)

Question 340682: 5h-7=2(h+1)
Click here to see answer by rfer(12657)

Question 340685: OK heres another story problem that i got confused on and need help. Even my dad didn't get either of them. Oh, and the square in the problem is just a regular square: "In the square, the variable represents a positive whole number. Find the value of such that the area and the perimeter of the square are the same."
Click here to see answer by Alan3354(30993)

Question 340726: How do you simplify 3x - 6 - 2(x - 4)
Click here to see answer by mananth(12270)

Question 340702: 78 decreased by a number m
Click here to see answer by nyc_function(2733)

Question 340910: (x-2)^2 +4 =10
Click here to see answer by nerdybill(6958)

Question 341104: 8 more than a number x
Click here to see answer by Alan3354(30993)

Question 341164: What does x equal ? x^2+3x=4
Click here to see answer by stanbon(57290)

Question 341195: Can you help me solve this problem?
-6-(3a-7)-2a=a-6
Click here to see answer by stanbon(57290)

Question 341172: How would I use five 3s to write an expression who's value is 29?
Click here to see answer by Edwin McCravy(8904)

Question 341160: Which expression does not equal the others?
A. 7n*1/4
B. 7n/4
C. 7*1/4n
D. n*7/4
Click here to see answer by edjones(7569)

Question 341168: How would I use five 3s to write an expression who's value is 3?
Click here to see answer by edjones(7569)

Question 341170: How would I use five 3s to write an expression who's value is 27?
Click here to see answer by edjones(7569)

Question 341242: Write a variable expression for the number of calories in e eggs
and one slice of bread.
Bread slice = 55
egg = 110

Thank you.
Jennifer
Click here to see answer by texttutoring(324)

Question 341254: 8q +5r -7q -6r simplify
Click here to see answer by texttutoring(324)

Question 341254: 8q +5r -7q -6r simplify
Click here to see answer by nyc_function(2733)

Question 341017: the square root of 81x to the fourth and y squared
Click here to see answer by Fombitz(13828)

Question 341397: I'm probably making this seem harder than it looks, but my course papers involve this example of rearranging an equation to make an unknown the subject.
This is the question in full.
The surface area (A) of a rectangular prism is given by the formula:
A=2(bh+hl+lb)
Evaluate b when A=11750sq mm; h=25mm and l=75mm
I know the idea is to make b the subject first by rearranging, but I'm having difficulty coming to how to rearrange this formula without changing it beyond its function.
Please help!
Thanks
Craig Jenkins (supposed engineering student.)
Click here to see answer by Alan3354(30993)

Question 341443: when x=1, 2x^2-3x+7=
Click here to see answer by Fombitz(13828)

Question 341441: factor the trinomial
v^3-3v^2-40v
Click here to see answer by Fombitz(13828)

Question 341449: Solve;
x^2=6x-4=0
Click here to see answer by Fombitz(13828)

Question 341451: Factor Completely;
3x^8-15x7^15+15x^6
Click here to see answer by Fombitz(13828)

Question 341525: A 24-foot board is cut into two pieces. Twice the length of the shorter piece is 3 ft less than the length of the longer piece. Find the length of each piece.
Click here to see answer by edjones(7569)

Question 341651: Tell which rate is greater.
1 and 1/4 miles in 2 minutes and 4 seconds. Or, 1 and 3/16 miles in 1 minute and 55 seconds.
Click here to see answer by Alan3354(30993)

Question 341650: Write an expression for the situation.
Number of hours in m minutes.

Click here to see answer by jim_thompson5910(28546)

Question 341780: ok here it is , tx-4x+3t you have to solve for x but how do i do this when there is two x's
Click here to see answer by Edwin McCravy(8904)

Question 341786: tx-4x=3 you have to solve for x but how do you do it with two x's
Click here to see answer by Alan3354(30993)

Question 341787: tx-4x=3t you have to solve for x but how do you do it with two x's
Click here to see answer by Fombitz(13828)

Question 341842: How would you solve-2c+3(c+15)=c-7(-c+3)-9(-8+5c)?
Click here to see answer by mananth(12270)

Question 342166: number of feet in m yards
Click here to see answer by unlockmath(1599)

Question 342169: My daughter and I are stumped on how to set up this equation. I hope we picked the correct topic for this problem... Here's the question:
Geno worked at the China Store on Sunday packing dishes for shipment. He received 5 cents for each piece he packed successfully and was fined 12 cents for each piece he broke. If he handled 187 pieces, and was paid $8.16 how many pieces did he break?
We know it's not the correct way to do the problem, but we started by assuming that if he handled all 187 pieces without breaking any, then he would have earned $9.35. Then we started subtracting multiples of .12 to see if we could end up at $8.16. We know there's a correct way to set up the problem but couldn't get it.
Would you please give us as much detail as possible so that we (she) will be able to do similar problems on her own? Thank you so much!
Click here to see answer by Alan3354(30993)

Question 342122: Would someone please help me? I am absolutely desparate and stuck on these two problems. I would appreciate any help I can get. Thanks
Solve by the elimination method
5r-6s=4
6r+5s=17
Solve by the substitution method
6x+7y=8
x=16-3y
Click here to see answer by ankor@dixie-net.com(15647)

Question 342246: i need help on trying to understanding how to evaluate each expression for the given values of the variables such as 7p-2t+3for p=6andt=2 can u simpleflie this for me please .
Click here to see answer by mananth(12270)

Question 342177: help solve 1/5 (x+3) = x - 5
Click here to see answer by Alan3354(30993)

Question 342231: expressions 16t^2 models the distance in feet that an object falls during t seconds after being dropped. find the distance an object falls during each time. 0.25 seconds
Click here to see answer by nyc_function(2733)

Question 342401: how do I solve this equation ? 2-3x/5 < x+2,
Click here to see answer by Fombitz(13828)

Question 342453: A=1/2bh, solve for h
Click here to see answer by Fombitz(13828)

Question 342462: V=lwh, for w
Click here to see answer by checkley77(12569)

Question 342513: how would you write an expression to determine the number of frames in a movie when there are 24 frames in one second of movie footage?
Click here to see answer by jim_thompson5910(28546)

Question 342521: I need help with the following questions
" number of days left in the week if "d" days have passed so far "

Click here to see answer by jim_thompson5910(28546)

Question 342633: Im in need of help, in my 8th grade algebra class.
I need help with Solving Equations with Variables on Both Sides.
Such as.
4n+6-2n= 2(n+3)
Click here to see answer by stanbon(57290)

Question 342620: may you please help me with a couple of questions i am enrolling in honors algebra and i barely get it can u help me with this equation:
Click here to see answer by solver91311(16877)

Question 342648: If x + 4 y = 10 and - x + 5 y = 8 what is the value of 3x - 2?
Click here to see answer by Fombitz(13828)

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