Solve.In the table, x is directly proportional to y. Find the undetermined value.
A. -8.5
B. 81.6
C. -81.6
D. 8.5
Answer: C
Mathematics
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Use reference angles to find the exact value of the expression. Do not use a calculator.tan 
A. 
B. 
C. 1
D. -1
Mathematics
Perform the indicated operation and simplify if possible.
÷ 
A. 
B. 
C. 
D. 
Mathematics
Use the formula for the sum of the first n terms of a geometric sequence to solve.Find the sum of the first 11 terms of the geometric sequence: -7, -14, -28, -56, -112, . . . .
A. -14,292 B. -14,329 C. -14,327 D. -14,349
Mathematics
Factor the polynomial f(x). Then solve the equation f(x) = 0.f(x) = x3 + 5x2 - 9x - 45
A. (x - 3)(x + 3)(x - 5) ; 3, -3, 5 B. (x + 3)(x + 3)(x - 6) ; 3, -3, 6 C. (x + 3)(x - 3)(x + 5) ; -3, 3, -5 D. (x - 3)(x + 3)(x - 5) ; -3, 3, -5
Mathematics