posted by on .

1) Solve the equation: 15(7x-6) = 3x-5

2) Mary and her brother collect coins. Mary has 4 times the number of coins that her brother has. Together they have 175 coins. How many does Mary have?

3) Perform the indicated operations. Express the answer as a single polynomial in standard form.
(x-1)(x^2 + 2x -3)
My answer is x^3 + x^2 - 5x + 3

4) Determine which values must be excluded from the domain.
x / x^2 - 9
My answer is x=3 and x=-3

5) Solve the equation. The letters a,b,c are constants.
ax-b=c; a is not equal to 0.
My answer is x=b + c / a

6) Find c in the following.
For 4x^2 - 12x + c to be a perfect square, c must be?
The choices are 9 , 3 ,-9, 0, or noe of the above.
My answer is none of the above.

7) Write the statment using symbols.
The sum of four and x is the product of 5 and y.

My answer is 4+x = 5y

8) write the number as a decimal.
3.875 x 10^-9

all ok, except #5 and #6
in #5 write it as (b+c)/a or else only b is divided by a

#6 should be 9 so that
4x^2 + 12 + 9 = (2x+3)^2

Thank you!

(x-2)(x+2)
___________
2(x-3)