Write the sentence as an equation. Let the variable x represent the number.The product of 13 and a number yields 26.
A. x + 13 = 26
B. 
= 26
C. 13x = 26
D. 26x = 13
Answer: C
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Solve the problem.From a thin piece of cardboard 30 in. by 30 in., square corners are cut out so that the sides can be folded up to make a box. What dimensions will yield a box of maximum volume? What is the maximum volume? Round to the nearest tenth, if necessary.
A. 20 in. × 20 in. × 10 in.; 4,000 in3 B. 10 in. × 10 in. × 10 in.; 1,000 in3 C. 20 in. × 20 in. × 5 in.; 2,000 in3 D. 15 in. × 15 in. × 7.5 in.; 1,687.5 in3
Rationalize the denominator. 
A. 
B. 
C. 
D. 
Determine independence. Answer Yes or No.The table shows the political affiliation of voters in one city and their positions on stronger gun control laws. ?Stronger Gun Control 
Are party affiliation and position on gun control laws independent?
A. Yes B. No
The graphs show the sales of two companies competing for market share. Use the graphs to answer the question.
If x represents Company B's sales in 1990 and y represents Company B's sales in 1993, the relationship between x and y is
A. x = y B. x ? y C. x > y D. x < y