Solve the formula for the indicated letter. Assume that all variables represent nonnegative numbers.A = 
?r2 for r
A. r = ±3
B. r = ±
C. r = ±
D. r = ± 
Answer: C
Mathematics
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Perform the indicated operations. [(13x9 + 13) - (- 9x7 + 9x3 )] - [(10x9 - 11x5 + 9x) + (10x3 - 9x- 5)]
A. -3x9 + 9x7 + 11x5 - 19x3 + 18 B. 3x9 + 9x7 + 11x5 - 19x3 + 18 C. 3x9 + 9x7 - 11x5 - 19x3 + 18 D. -3x9 + 9x7 - 11x5 - 19x3 + 18
Mathematics
Find a general term an for the arithmetic sequence.a1 = 4, d = 2
A. an= n + 2n B. an= 4n C. an= 2n + 4 D. an= 2n + 2
Mathematics
Solve the problem.Given the following revenue and cost functions, find the maximum profit. (Recall that profit equals revenue minus cost.) R(x) = 53x - 2x2; C(x) = 21x + 100
A. $28 B. $156 C. $228 D. $128
Mathematics
The graph of a function f is given. Use the graph to answer the question.Is f(6) positive or negative?
A. positive B. negative
Mathematics