Simplify the expression.cos(x + ?) cos(? - x) + sin(x + ?) sin(? - x)
A. 1
B. cos(2x + 2?)
C. 0
D. sin(2x + 2?)
Answer: A
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Factor the expression completely. If the polynomial is prime, state this as your answer.49x2 - 14x + 1
A. (7x - 1)2 B. (7x + 1)(7x - 1) C. prime D. (x - 7)2
Translate the word statement into a percent equation. Do not solve.27% of what number is 77?
A. 27% ? n = 77 B. 27 ? 77 = n C. 27 ? n = 77 D. 27% = 77 ? n
Solve the problem.Which of the following investments is larger after 10 years?
A. An initial amount of $14,000 is deposited with $700 deposited monthly, with interest earned at 3% compounded monthly. B. An initial amount of $16,800 is deposited with $8400 deposited annually, with interest earned at 3% compounded annually.
Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.a + ar + ar2 + . . . + ar14
A. 
B. 
C. 
D. 