The given pattern continues. Write down the nth term of the sequence {an} suggested by the pattern.3, -6, 9, -12, ...
A. an = (-1)n ? 3
B. an = (-1)n + 1 ? 3
C. an = (-1)n ? 3n
D. an = (-1)n + 1 ? 3n
Answer: D
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Add.1.564a + 6.4a
A. 7.965a B. 8.074a C. 7.954a D. 7.964a
Solve the problem.A piece of rectangular sheet metal is 21 inches wide. It is to be made into a rain gutter by turning up equal edges to form parallel sides. Let x represent the length of each of the parallel sides. For what value of x will the area of the cross section be a maximum (and thus maximize the amount of water that the gutter will hold)? If necessary, round to 2 decimal places.
A. 84 in. B. 42 in. C. 5.25 in. D. 10.5 in.
Solve.Answer the question true or false.72 + 92 = (7 + 9)2
A. True B. False
Find the perimeter or area of the figure as indicated. Express your answer in simplified radical form.Find the perimeter of the trapezoid. 
A. (17
+ 3
) in.
B. 22
in.
C. 896 in.
D. 23
in.