Factor the difference of squares.x2 - 81
A. (x + 9)(x + 9)
B. (x - 9)(x + 9)
C. (x - 9)(x - 9)
D. Cannot be factored
Answer: B
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Rewrite as an expression using only positive exponents.
A. p-1
B. p9
C. 
D. p-9
Remove parentheses and simplify the expression.(2x - 5y + 7) - 2(-2x + 5y - 7)
A. -4x + 10y - 14 B. 4x - 10y + 14 C. 6x - 15y + 21 D. -6x + 15y - 21
Use a proportion to solve the problem.A poll of 2000 people indicated that 3 out of 5 people were planning on voting in the next election. Of the people who intend to vote 11 out of 20 will vote for the Republican candidate. How many people in the poll will vote for the Republican candidate?
A. 1200 people B. 1100 people C. 540 people D. 660 people
When squares of side x inches are cut from the corners of a 35-inch-square piece of cardboard, an open-top box can be formed by folding up the sides. The volume of this box is given by 
, find the rate of change of volume with respect to the size of the squares.
?
A. 
B. 
C. 
D. 
E. 