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

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

Question 255907: how do you solve for a in this equation, a(2a/5)=3 ?
Click here to see answer by edjones(7569)

Question 256016: when you have a question when it asks you something about triangles and you have to solve it with scale factor. How do you solve it with any ni=umbers but it has to have decimal in it.
Click here to see answer by stanbon(57967)

Question 256068: Can you break down the steps to solving this math problem: 4x-6=2x+4 I know X=5 but how do you get that answer? also -3x+8=-2x+10
Click here to see answer by drk(1908)

Question 256236: can you give me the breakdown of this math problem so that I can explain to a 11 year old to help with her homework
x + 1 = 1 1/4
3/4 - y = x
Click here to see answer by palanisamy(496)

Question 256341: Use substitution to solve 4t^1/3 - 5t^1/6 + 1 = 0.
I first tried multiplying the exponent of 4t^1/3 by 3 to get 4t^3 and was wondering if that was correct, if not what is? If it is, where do I go from there, do I just repeat it by multiplying 6 to the other side and setting it all equal to -1?
Thanks.
Click here to see answer by scott8148(6628)

Question 256343: solve each system using substitution. Write no solution or infinitely many solutions where appropriate.
4x+2y=8
y=-2x+4
Click here to see answer by Fombitz(13828)

Question 256594: can you explain to me how to solve for a variable? My parents don't even know.
Click here to see answer by checkley77(12569)

Question 256594: can you explain to me how to solve for a variable? My parents don't even know.
Click here to see answer by drk(1908)

Question 256593: suppose the ratio of girls to boys in your school is 19:17. Theree are 1908 students altogether.
A. Solve the proportion g/b=19/17
B. Write and solve the system of equations to find the total number of boys b and girls
Click here to see answer by stanbon(57967)

Question 256615: How do you isolate a varible?
Click here to see answer by Alan3354(31518)

Question 256543: My daughter is supposed to solve this problem using substitution. I don't get it. The problem is:
-7x-2y= -13
x-2y=11
Can you help me try to explain this to her?
Click here to see answer by Alan3354(31518)

Question 256541: 1. Simplify the following expressions.
(-1)^1,(-1)^2,(-1)^3,(-1)^4,(-1)^5
2. What is the sign of the final answer when the exponent is odd? When the exponent is even?
3. Use your answer from part (b) to simplify (-1)^19

Click here to see answer by checkley77(12569)

Question 256688: what algebraic expression represent six less than half a number
Click here to see answer by stanbon(57967)

Question 256688: what algebraic expression represent six less than half a number
Click here to see answer by NRobinson(4)

Question 256688: what algebraic expression represent six less than half a number
Click here to see answer by yop(2)

Question 256688: what algebraic expression represent six less than half a number
Click here to see answer by Alan3354(31518)

Question 256656: Does P=w/t equal p*w=t?
Click here to see answer by Alan3354(31518)

Question 248086: solve this equation.

x+y=5
5-y=x
y-4=3

Click here to see answer by jwezen(1)

Question 248086: solve this equation.

x+y=5
5-y=x
y-4=3

Click here to see answer by Alan3354(31518)

Question 256855: (1/x)-(2/x+1)=[5/(x*x)+x] -2
I just need to simplify this!
Click here to see answer by Stitch(352)

Question 256855: (1/x)-(2/x+1)=[5/(x*x)+x] -2
I just need to simplify this!
Click here to see answer by drk(1908)

Question 256898: Please help me with this problem:
(1/4)(8m-3) = (4/7)(3m-4)+9
Solving for m, of course.
I know I have to multiply by the common denominator, but I forgot all of which I multiply.
Your help would be greatly appreciated!
Click here to see answer by CharlesG2(828)

Question 256937: the school kitchen had 11 cases of juice plus 3 extra cans of juice. after lunch they had 6 cases of juice and no extra cans. how many cans of jucie were sold during lunch? (note: a case contains 24 cans.) i dont get it
Click here to see answer by Fombitz(13828)

Question 256978: Do you know answer the -3 (4 - 5) + (9 5 + 3) / 3?

Click here to see answer by richwmiller(9144)

Question 257223: Write an expression for the area of the shaded region of a square. the problem shows 2 squares 1 inside the other, with the outside square shaded in. The numbers on the smaller inside square is 4 and 4 and the outside square that is shaded in is x and x variables. I was thinking that the answer would be x²+ x². Is this soultion the right way? Thank You for your time.
Click here to see answer by drk(1908)

Question 257440: I am confused about simplfying by removing factors of one when a lot of letters are used, for example:
z^2-12z+32/z^2+z-20
Help please!
Click here to see answer by Alan3354(31518)

Question 257533: solve the following expression for z. - 3/4 - 2/3 = 1/3
Click here to see answer by stanbon(57967)

Question 257544: four times the difference of a number and 3 is the same as 6 times the number increased by 1.
Click here to see answer by stanbon(57967)

Question 257539: I don't remember how to handle this expression: 6 - 12t / 3 + 3t
Click here to see answer by rfer(12730)

Question 257539: I don't remember how to handle this expression: 6 - 12t / 3 + 3t
Click here to see answer by checkley77(12569)

Question 257608: Soybean meal is 14% protein;cornmeal is 7% protein. how many pounds of each should be mixed together in order to get 280-lb that is 8% protein? How many pounds of the other cornmeal should be in mixture? How many lbs. of soybean meal should be in mixture?)
Click here to see answer by richwmiller(9144)

Question 257715: an ad for a special baseball card that was posted on the itnernet claims that the value of the card "doubles every year." Jerome buys the card for 40$ at the end of the year 2001. If the value of the card does indeed double every year, in what year will the value of the card first reach $5000
Click here to see answer by dabanfield(803)

Question 257676: what is a algebraic expression

Click here to see answer by rfer(12730)

Question 257763: what is 3x-2y=3
and 25x+10y=215
Click here to see answer by checkley77(12569)

Question 257885:
Click here to see answer by edjones(7569)

Question 257919: A nut wholeseller sells amix of peanuts & cashews. Rhe wholesaler charges $2.80 per pound for peanuts and %5.30 per pound for cashews. The mix is to sell for $3.30 per pound. How many pounds of peanuts and how many punds of cashews should be used to make 100 pounds of the mix?
Click here to see answer by palanisamy(496)

Question 257890: Apply the order of operations to simplify the following expression. 2x[(5x^2-3x+2)-(6x^3+6x^2)/3x^2]
Click here to see answer by Theo(3504)

Question 258108: 4y-4/8 +26/2 =1/4
Click here to see answer by checkley77(12569)

Question 258108: 4y-4/8 +26/2 =1/4
Click here to see answer by drk(1908)

Question 258108: 4y-4/8 +26/2 =1/4
Click here to see answer by MRperkins(300)

Question 258117: x-3y+2x-6y
Click here to see answer by drk(1908)

Question 258123: I have two problems. Please help.
Problem one: Evaluate 8x, when =7
Problem two: Evaluate 6y, when y=7
Click here to see answer by drk(1908)

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