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

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Algebra: Expressions involving variables, substitution

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Question 62079: Hi,
I am trying to help my child with some homework and we are stuck as there is nothing in the text book to explain how the solutions are found. Here are the questions from each section with one of the samples. Please could you explain to us how you work them out also?
1. Factorise the following expressions.
a) 8a=16
2. Write the following as single powers.
a) y squared + y cubed
3. Expand the following.
a) x(x+2y)
4. Expand the brackets in these expressions.
a) 2(x+3)+2(x+4)
Click here to see answer by ankor@dixie-net.com(6691)

Question 62114: I NEED HELP ON THIS PROBLEM {{ x+y=10}}
{{ y=x-4}}

in the book doesent explain it well and when mt teacher tells me how to do it its confusing! can u help me
thank you!
Click here to see answer by stanbon(26259)

Question 62181This question is from textbook
: T = fm - gm Solve for m (Engineering)This question is from textbook

Click here to see answer by checkley71(8405)

Question 62180This question is from textbook
: P = R - C
_______
n Solve for R (Business)This question is from textbook

Click here to see answer by checkley71(8405)

Question 62178This question is from textbook
: F = 9/5 C + 32 Solve for c (Tempertature conversion)This question is from textbook

Click here to see answer by joyofmath(189)

Question 62305: (x2 +2x -1)2
Click here to see answer by funmath(2873)

Question 62179This question is from textbook
: P = R - C Solve for C (Business)This question is from textbook

Click here to see answer by checkley71(8405)

Question 62385This question is from textbook prealgebra
: need help again srry
5n + 12=2n
and
6(x+3)+3x=3(x-2)This question is from textbook prealgebra

Click here to see answer by stanbon(26259)

Question 62375This question is from textbook prealgebra
: i dont know how to solve equations with two variables on both sides
ex: 3x-7 = 4x+5This question is from textbook prealgebra

Click here to see answer by funmath(2873)

Question 62336: Can you please help me factor 2t^2 - 19 - 6t =
Click here to see answer by checkley71(8405)

Question 62410: Can you please help me factor 2t^2 - 19 - 6t
Click here to see answer by venugopalramana(3286)

Question 62273: Solve for x. 1/y = 3/5 - 2/x
Click here to see answer by jai_kos(139)

Question 62374This question is from textbook prealgebra
: i dont know how to solve equations with two variables on both sides
ex:5x - 32 = 1n + 8 This question is from textbook prealgebra

Click here to see answer by funmath(2873)

Question 62454This question is from textbook Algebra 1

: How would you solve this?
v=r+at for aThis question is from textbook Algebra 1

Click here to see answer by funmath(2873)

Question 62490: Solve for n
400*(1.2^n)-680*(.85^n)=0 "^n =raised to power of n"
I used excel solver and found that n=1.54 but how do you do it and show the work?

Thanks
Click here to see answer by stanbon(26259)

Question 62574: I am having some very big troubles solving this equasion: y^5 plus y^4 plus y^3 plus y^2 divided by y^2
Click here to see answer by funmath(2873)

Question 62636This question is from textbook An Incremental Development

: Please help me solve
Evaluate
a - |b| * a^2 - ba if a = -3 and b = -4This question is from textbook An Incremental Development

Click here to see answer by funmath(2873)

Question 62783: Can you please help me solve by using the subtitution and elimination method (unless there is no infnite number or solution.)
y = 4 - x,
3x + 4y = 21
Click here to see answer by jai_kos(139)

Question 62784: Can you please help me solve by using the subtitution and elimination method (unless there is no infnite number or solution.)
x + 2y = 6,
2x + y = 8
Click here to see answer by jai_kos(139)

Question 62850: the problem is:
and
(find c in terms of a)
when i did the second expression, i got 80b=280-56a
then i substituted this into the first and got
c=800-112a as my final answer
is this right??
thanks
Click here to see answer by Earlsdon(4898)

Question 62925This question is from textbook Saxon Algebra 1
: I am having trouble understanding how to distribute the negative number. Please explain.This question is from textbook Saxon Algebra 1

Click here to see answer by stanbon(26259)

Question 63144: I need serious help

8(5-y)=64
-3x=-5(x-8)
4(m-4)=3(m+5)
Click here to see answer by ankor@dixie-net.com(6691)

Question 63161This question is from textbook An Incremental Development

: help would be appreciated!
Use substitution to solve
x + 3y = -3
and
3x - 5y = 19This question is from textbook An Incremental Development

Click here to see answer by jai_kos(139)

Question 63362: -7+5+5c=25
Click here to see answer by pftsta3(3)

Question 63398: 1/4x+12 - 1/x^2-9= 5/x-3
thank you
Click here to see answer by Cintchr(475)

Question 63410: a)x^2-2x=15
b)3x^2+19+1=0
thank you very much
Click here to see answer by 303795(562)

Question 63348: solve. a)x^2 - 2x=15 b)3x^2+19+1=0 c)1/4x +12 - 1/x^2-9=5/x-3
thank you so much.
Click here to see answer by ankor@dixie-net.com(6691)

Question 63839: The perimeter of the garden is enclosed by fencing that costs $10/ft. The garden is in the shape of a regular pantagon. The total cost of the fence is $450. How long is each side of the garden?
Click here to see answer by stanbon(26259)

Question 63857: one number plus six times that number equals 133 find the number
Click here to see answer by sarahschober(35)

Question 63867This question is from textbook
: 3.4x=2.1x+3.9This question is from textbook

Click here to see answer by checkley71(8405)

Question 63877This question is from textbook Algebra 1
: The number of inches in the perimeter of a square is 3 more than the number of square inches in its area. Find the legnth of a side.
THANK YOU SO MUCH!This question is from textbook Algebra 1

Click here to see answer by stanbon(26259)

Question 63910This question is from textbook Algebra 1
: Find two consecutive positive numbers such that the product of the sum and difference of the numbers plus eight is the sum of their squares.
THANK YOU!!!!!!This question is from textbook Algebra 1

Click here to see answer by venugopalramana(3286)

Question 63909This question is from textbook Algebra 1
: Mark launched a model rocket with an initial speed of 180 ft per second. After how many seconds will Mark's rocket reach a height of 464 ft?
a) The formula h=rt-16t^2 gives the height of an object projected upward at a rate of r feet per second after t seconds. Rewrite this equation substituting the data you are given.
b) Solve the equation and answer the problem.
c) After how many seconds will it be at that height again?
THANK YOU!!!!!!This question is from textbook Algebra 1

Click here to see answer by venugopalramana(3286)

Question 63907This question is from textbook Algebra 1
: If the sides of a square are legnthened by 7 in.,the area becomes 121 in.^2. Find the legnth of a side of the original square.
THANK YOU SO MUCH!This question is from textbook Algebra 1

Click here to see answer by tanimachatterjee(60)

Question 64033: 19-4(5n+1)-4n
Click here to see answer by sarahschober(35)

Question 64094This question is from textbook prentice hall algebra1
: This question is from textbook prentice hall algebra1

Click here to see answer by funmath(2873)

Question 64165: I am having difficulties using symbolic expressions to relate to verbal representations. Here is my problem:
Janice rented a moving van for one day at a rate of $30 per day plus $0.25 per mile. What expressions could be used to find the cost of renting the moving van for one day?

Click here to see answer by stanbon(26259)

Question 64514: REAL WORLD PROBLEM!!!
Source: http://verizonmath.blogspot.com/
Verizon Wireless charges for data use. Their rate for this data use is .002 cents per kilobyte. If George uses 35,893 kilobytes, What does he owe in dollars?
Click here to see answer by stanbon(26259)

Question 64524: REAL WORLD PROBLEM!!!
Source: http://verizonmath.blogspot.com/
Verizon Wireless charges for data use. Their rate for this data use is .002 cents per kilobyte. If George uses 35,893 kilobytes, What does he owe in dollars?
Click here to see answer by checkley71(8405)

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