Let a and b be the lengths of the legs of a right triangle, and let c be the length of the hypotenuse. Values of two of the three lengths are given. Find the third length.b = 48, c = 52
A. a = 400
B. a = 20, -20
C. a = 80
D. a = 20
Answer: D
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?Gas costs $3.10 a gallon. Which of the following represents the function that expresses the independent variable as a function of the dependent variable? ?
A. ?x = 3.1y, where y is the independent variable and x is the dependent variable. B. ?y = 3.1x, where x is the independent variable and y is the dependent variable. C. ?y = 3.1x, where y is the independent variable and x is the dependent variable. D. ?y = 3.1, where y is the independent variable and the dependent variable. E. ?None of the above.
Solve the problem.If a fair coin is tossed three times, the probability of tossing three heads is
A. 
.
B. 
.
C. 
.
D. 
.
E. none of these
Use the right triangle shown below and find the missing length. Give an exact answer and a decimal approximation rounded to two decimal places. 
a = 32, b = 60
A. c = 68, -68 B. c = 1156 C. c = 68 D. c = 4624
5y - 35 + xy - 7x
A. (y - 7)(5 + x) B. (y - 7x)(5 + x) C. (x - 7)(5y + x) D. (x - 7)(y + 5)