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

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

Question 107626: Solve and check each of the following equations for x.
(2)/(x+ 2)=(3)/(x+ 6)+(9)/(x^2 +8x+ 12)

Click here to see answer by scott8148(6628)

Question 107679: 3x-5y=15
2x-y=-4
substitution 2 variables

Click here to see answer by jim_thompson5910(28715)

Question 107632: Tina can run 12 mi in the same time it takes her to bicycle
72 mi. If her bicycling rate is 20 mi/h faster than her running rate, find each
rate.

Click here to see answer by ankor@dixie-net.com(15746)

Question 107718: 1. Find the domain: square root of 10-2x
2. Simplify without radicals square root of (25x^2 + 16)^2
3. Write as a radical expression A^2/5
4. Rewrite under one radical square root of x times square root of (x^4)^5

Thank You Very Much!!!
Click here to see answer by stanbon(57967)

Question 107741: For each of the following problems, let x represent the number and then write an
expression for the product.
42. The square of 5 more than a number
Click here to see answer by checkley71(8403)

Question 107734: 86. What expression raised to the fourth power is 81x12y8z16?
Click here to see answer by checkley71(8403)

Question 107813: given f(x)= -x^3+2x^2-2x-2, find f(-2) and f(0)
Click here to see answer by jim_thompson5910(28715)

Question 107817: given f(x)=x^2-3x-7, find f(5)
Click here to see answer by checkley71(8403)

Question 107817: given f(x)=x^2-3x-7, find f(5)
Click here to see answer by MathLover1(6812)

Question 107817: given f(x)=x^2-3x-7, find f(5)
Click here to see answer by josmiceli(9817)

Question 107811: solve the system by addition or substitution:
-15x+3y=6
y=2+5x
Click here to see answer by checkley71(8403)

Question 107814: A.Can you please give me an example of a system of equations that is more easily solved by substitution?
B. Can you give me an example of a system of equations that is more easily to solve by addition?
Click here to see answer by MathLover1(6812)

Question 107810: solve the system by substitution:
4x-4y=0
y=2x-5
Click here to see answer by checkley71(8403)

Question 107809: solve the system by substitution:
4x-4y=0
y=2x-5
Click here to see answer by scott8148(6628)

Question 107863: Help me please, I have tried to understand how to do this one..
Write the expression in simplest form.
ab - 3a + 5b – 15/15 + 3a^2 - 5b – a^2b
Thank you

Click here to see answer by stanbon(57967)

Question 107925: a+b/4=11
a+c/5=b/3
a=5d
Is there enough information here to solve this problem? thanks
Click here to see answer by scott8148(6628)

Question 108139: p=ad divided by e, solve for e
Click here to see answer by Fombitz(13828)

Question 108138: p=ad
--
e
Solve for e
Click here to see answer by stanbon(57967)

Question 108137: Cx+Gy=M, for x, solve for x
Click here to see answer by checkley71(8403)

Question 108291: PLEASE HELP.
COMPLETE THE ORDERED PAIRS SO THAT EACH IS A SOLUTION FOR THE GIVEN EQUATION.

1. 3x + 4y =12 (0, ),( ,3/4),( ,0),(8/3, )

2. y = 3x + 9 ( ,0),(2/3, ),(0, ),(-2/3, )
THANKS
JMS

Click here to see answer by stanbon(57967)

Question 108303: Can you expand: 1/(a+b) to something like c/d + e/f ?
Thank you!
Click here to see answer by wgunther(43)

Question 108225: x+y+z=-1
2x-y+2z=-5
-x+2y-z=4
Click here to see answer by Edwin McCravy(8999)

Question 108416: Word problem where the sum equals 9.90 the question is how many are dimes and how many are quarters if there are twice as many dimes as quaters. How do you set up this word problem to arrive at the answers for the numbers of dimes and quarters.
Click here to see answer by checkley71(8403)

Question 108237: how do solve for the linear combination?
Click here to see answer by elima(1433)

Question 108420: im not sure if im doing my problems correctally here is one if them, c/-59=-7
the first set of numbers being a fraction
Click here to see answer by checkley71(8403)

Question 108492: Write the following phrase using symbols.
Use the variable x to represent the number.

Eight less than three times a number

Click here to see answer by HyperBrain(694)

Question 108608: How do you do equations with variables on both side
Click here to see answer by checkley71(8403)

Question 108532: I've figured this out (trial and error) but need help with setting up the formula.
Mr. Jones has $7000 to invest. He invests part at 8% and the rest at 8.5%. The amount at 8.5% makes $65 less at the end of the year than the amount invested at 8%. What amount has he invested in each account?

Click here to see answer by ankor@dixie-net.com(15746)

Question 108753: Under certain conditions, the power P, in watts per hour, generated by a windmill with winds blowing v miles per hour is given by
P(v)= 0.015v^3 a) find the power generated by 15-mph b) how fast must the wind blow in order to generate 120 watts of power in one hour?
I put in 15 for x on the first part. second part I left the equation solved for a and divided by 120. I don't think this resulted the correct answers, help.
Click here to see answer by stanbon(57967)

Question 108791: How to correctly format an algebraic relationship statement. I started with
(I have to create a statement)
10x+4=36
x=3
10x3=30+4=36
Is this the proper way to preform this type of equation?
Click here to see answer by MathLover1(6812)

Question 108816: A number is 2 less than twice another number. If their sum is 61, find both numbers. HOW DO I WRITE THIS AS AN EQUATION AND SOLVE
Click here to see answer by doukungfoo(195)

Question 108751: A stone thrown downward with an initial velocity of 34.3 m/sec travel a distance of s meters, where:
s(t)=4.9t + 34.3t
and t is in seconds. If a stone is thrown downward at 34.3m/sec from a height of 294 m, how long will it take the stone to reach the ground?
I am putting 294 in for t and trying to solve it that way. Is this correct? If not please let know where I am going wrong.
Click here to see answer by scott8148(6628)

Question 108691: mark has $3.25 in nickles and dimes. he has eight more nickles than dimes. how many nickles and dimes does he have??
Click here to see answer by scott8148(6628)

Question 108879: a/b=c for b
Click here to see answer by checkley71(8403)

Question 108899: cant figure this out (5x+y)/a=2,for a
Click here to see answer by edjones(7569)

Question 108881: I am having trouble finding the steps to solve this problem. 2Q^3 -11Q^2 -100=0. My text give me the answer of Q=6.64 but not the steps to solve it which I will need to solve other problems. Please help.
Click here to see answer by stanbon(57967)

Question 108910: This question needs to be solved with the addition/elimination method.
0.4x-0.1y=0.3
-80x+20y=40
Click here to see answer by chitra(359)

Question 108932: 5x-20+3x-2=180
Click here to see answer by stanbon(57967)

Question 109007: PLEASE HELP WITH THE FOLLOWING PROBLEM:
SOLVE FOR x. 3x-2y=6
THANKS
JMS
Click here to see answer by ankor@dixie-net.com(15746)

Question 108989: Solve by addition or subtraction. If a unique solution does not exist, state whether the system is dependant or independent.
10x+2y=7
y=-5x+3
Click here to see answer by mrkoje(1)

Question 109145: Hello,
I am stumped on this one please help,
If the area of a circle is 72 cm^2, find the radius to the nearest
hundredth.
Thanks!
Click here to see answer by theidiot(3)

Question 109161: what number is62 percent of 200?

Click here to see answer by edjones(7569)

Question 109144: I am wondering if I am doing this right...
The question is to:
Evaluate, if possible.
sqrt256/25 =16/5 ??????
another one has a minus sign before the sqrt I am not sure how to evaluate this one
-sqrt81
Thanks for your help,
Marco
Click here to see answer by edjones(7569)

Question 109192: Use Property 1 to simplify each of the following radical expressions. Assume that all variables represent positive real numbers.
Sqrt108

Click here to see answer by jim_thompson5910(28715)

Question 109224: Use Property 1 to simplify each of the following radical expressions. Assume that all variables represent positive real numbers.
sqrt200y^6
sqrt(5m^2)/2

Click here to see answer by jim_thompson5910(28715)

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