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

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

Question 112167: word problems are one of my weakest points in math...The eanswer i really dont care...but how to go about is wat i do care.....
in example:
Penny collected some change in preparation for a garage sale.She collected two more nickels than twice the number of dimes and eight fewer quarters than twice the number of nickels.if the value of quarters was $1.60 greater than four times the value of nickelsand dimes together, what was the total valueof the change that penny collected.

Click here to see answer by stanbon(57224)

Question 112161: A ball is thrown upward from the roof of a 120-ft building with an initial velocity of 20 ft/s. How long does it take the ball to fall back to the ground?
Click here to see answer by Earlsdon(6287)

Question 112160: Use the quadratic formula to solve the following quadratic equation
x^2- 4x+ 2 =0

Click here to see answer by jim_thompson5910(28476)

Question 112199: please show me how to do this.
Simplify the rational expression:
x2 – 3x – 10
x2 – x – 20

Click here to see answer by jim_thompson5910(28476)

Question 112203: please show me how to do this.
Perform the indicated operations:
√[50] + 2√[32] – √[8]

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Question 112204: please show me how to do this.
Multiply:
(5√[2] + 3)(√[2] – 2√[3])

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Question 112158: Graph the following quadratic equation after completing the given table of values.
y=-x^2- 2
x y
-2
-1
0
1
2
Click here to see answer by elima(1433)

Question 112206: please show me how to do this.
. Rationalize the denominator:
2/√[6] – √[5]

Click here to see answer by rapaljer(4667)

Question 112215: One leg of a right triangle is 2 ft longer than the shorter side. If the
length of the hypotenuse is 18 ft, how long is each leg?

Click here to see answer by scott8148(6628)

Question 112214: The sum of the lengths of one side of a right triangle and the hypotenuse
is 20 cm. The other leg is 5 cm shorter than the hypotenuse. Find the
length of each side.

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Question 112401: How would the following equations look on a graph? I would like to double check my answers, thank you.
y=x^2-4x
y= -x + 1
y =x + 1
and
y =2x^2
Click here to see answer by bucky(2189)

Question 112631: One bacterail culture is 18 days older than a second bacterial culture. In 10 days the first culture will be twice the age of the second. Find the present age of the two cultures.
x= age of second culture
x+10= age of second culturte in 10 days
x+18= age of first culture
x+18+10= age of first culture in 10 days
Click here to see answer by scott8148(6628)

Question 112719: Please help.
Solve the following systems by substitution.
5x - 2y = -5
y - 5x = 3
Thanks
JMS
Click here to see answer by jim_thompson5910(28476)

Question 112719: Please help.
Solve the following systems by substitution.
5x - 2y = -5
y - 5x = 3
Thanks
JMS
Click here to see answer by MathLover1(6617)

Question 112795: V= 4BH for h
Click here to see answer by checkley71(8403)

Question 112799: if A = BH express H in terms of A and B. (solve for H.)
Click here to see answer by MathLover1(6617)

Question 112798: S= 1half gt squared for g
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Question 112800: if F = 9 fifths C+32, find C when F = 95.
Click here to see answer by checkley71(8403)

Question 112800: if F = 9 fifths C+32, find C when F = 95.
Click here to see answer by solver91311(16868)

Question 112819: 3x(squared)-6x=0
Click here to see answer by solver91311(16868)

Question 112603: Jay's favoritebook is 182 pages less than three times Mitchel's favorite book. If both books have the same number of pages, how many pages are in Jay's favorite book?
Click here to see answer by ankor@dixie-net.com(15625)

Question 112612: 3x/y^3z^5 + -2/y^2z^4

thank you so much for helping me!
You have made my day!!! :D
Click here to see answer by ankor@dixie-net.com(15625)

Question 112854: I couldnt figure this one out(factoring)
8u^3-24u^2v+18uv^2

THANKYOU
Click here to see answer by jim_thompson5910(28476)

Question 112939: the question states:
if f(x)=-3x+12, find f(1/3).
Click here to see answer by jim_thompson5910(28476)

Question 113051: Please help.
Solve the following system by substitution.
4x - 12y = 5
-x + 3y = -1
Thanks
JMS
Click here to see answer by MathLover1(6617)

Question 113065: Please help
A small manufacturer’s weekly profit in dollars is given by
P=3x^2 +270x. Find the number of items x that must be produced to realize a
profit of $5775.

Thanks

Click here to see answer by checkley71(8403)

Question 113092: How to solve for X and Y. The problem is as follows
-3x-4y+2=7x+9y-8
Click here to see answer by MathLover1(6617)

Question 113282: This is the problem.
y=x-1
4x-y=19
This is what I tried.

4x-x-1=19
3x-1=19
3x=20
x=6 and 2/3
Thank you very much!
Click here to see answer by jim_thompson5910(28476)

Question 113282: This is the problem.
y=x-1
4x-y=19
This is what I tried.

4x-x-1=19
3x-1=19
3x=20
x=6 and 2/3
Thank you very much!
Click here to see answer by solver91311(16868)

Question 113345: Fred bought 3 shirts, each at the same price, and received less than $2.oo change from a $20.00 bill. What is the minimum cost of one shirt?
Click here to see answer by checkley71(8403)

Question 113347: The length of a rectangle is 10cm less than 3 times its width. If the perimeter of the rectangle is at most 180 cm, find the greatest possible length of the rectangle.
Click here to see answer by checkley71(8403)

Question 113355: A club agreed to buy at least 250 tickets for a theatre party. If it agreed to buy 80 less orchestra tickets than balcony tickets, what was the least number of balcony tickets it could buy?
Click here to see answer by josmiceli(9652)

Question 113454: leo has $4.00 IN DIMES AND QUARTERS. HE HAS 6 MORE DIMES THAN QUARTERS. HOW MANY QUARTERS DOES HE HAVE?
Click here to see answer by oberobic(2304)

Question 113699: Please help...
Solve the system by substitution:
3x-y=-7
x+y=-9
Thank you so much for your help!
Click here to see answer by checkley71(8403)

Question 113918: 8b - 4 (b-2) = 24
Click here to see answer by jim_thompson5910(28476)

Question 113920: 9 + 2(5v+3) = 13v
Click here to see answer by jim_thompson5910(28476)

Question 113959:

Solve the system by graphing.4x + 2y = 10
Solve the system by substitution. 3x – y = –7
x + y = –9

Click here to see answer by checkley71(8403)

Question 113534: I am having trouble working out this equation.
a= Q/(C(√64.4*e))-(√(a/π))
I want to solve for "a" but cannot figure out how to get the "a" in the right side of the equation to the left and in a form that is a= "answer".
Any help would be appreciated.
Sincerely, HosellaB.
Click here to see answer by scott8148(6628)

Question 114029: A school sold 200 tickets that totaled $980.00. Students ticket $4.00 and Adult ticket $5.50 . How many adult sold and how many students tickets were sold.
Click here to see answer by checkley71(8403)

Question 114218: The reciprocal of 4 plus the reciprocal of 5 is the reciprocal of what number? I am having such a hard time with this one I don't know why but I just can't get it!!
Click here to see answer by stanbon(57224)

Question 114216: A number minus two is equal to that number times the reciprocal of two. What is the number? I know it sounds easy but I am STUCK on it!!
Click here to see answer by ankor@dixie-net.com(15625)

Question 114339: I don't know where to ask this question - sorry, but thanks for your help.
Solve by factoring:
x^2-9x=-20
Click here to see answer by stanbon(57224)

Question 114449: Put the following expressions into simplified form.

Click here to see answer by jim_thompson5910(28476)

Question 114450: Rationalize the denominators
/
Combine

Click here to see answer by solver91311(16868)

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