Fill in the blank with one of the words or phrases listed below. 
A letter used to represent a number is called a(n) 
.
A. addend
B. variable
C. solution
D. place value
Answer: B
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Solve the problem.The library is to be given 5 books as a gift. The books will be selected from a list of 21 titles. If each book selected must have a different title, how many possible selections are there?
A. 20,349 B. 5.109094217e+19 C. 4.257578514e+17 D. 2,441,880
Use the rules for exponents to rewrite the expression and then evaluate the new expression. 3-2? 34
A. 
B. 6
C. -729
D. 9
There were 550 people at a play. The admission price was $2 for adults and $1 for children. The admission receipts were $810. How many adults and how many children attended?
A. 202 adults and 348 children B. 290 adults and 260 children C. 145 adults and 405 children D. 260 adults and 290 children
Solve the problem.A right triangle has an area of 16 square inches. The square of the hypotenuse is 80. Find the lengths of the legs of the triangle. Round your answer to the nearest inch.
A. 4 inches and 8 inches B. 2 inches and 16 inches C. 16 inches and 64 inches D. 8 inches and 4 inches