Use a half-angle identity to find an exact value for the following, given the information about x. Find cos x given that cos 2x = 
and 0 ? 2x < 
.
A. cos x = 7
B. cos x = 
C. cos x = 
D. cos x = 
Answer: C
Mathematics
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Find the requested polynomial. Find a polynomial function of degree 3 with 2, i, -i as zeros.
A. f(x) = x3 - 2x2 + x - 2 B. f(x) = x3 - 2ix2 + x - 2i C. f(x) = x3 - 2x2 + ix - 2i D. f(x) = x3 + 2x2 - x + 2
Mathematics
Find the total amount in the compound interest account.$9000 at 7.4% compounded semiannually for 2 years.
A. $10,421.51 B. $10,381.28 C. $9678.32 D. $10,407.77
Mathematics
Simplify.92 - 4 ? 2
A. 90 B. 73 C. 154 D. 50
Mathematics
Which response has the correct number of significant figures and units for the following mathematical operation?
a. 2 ×10–5kcal b. 1.8 ×10–5kcal c. 1.804 ×10–5J/cal d. 1.804 ×10–5kcal e. 1.80 ×10–5kcal
Mathematics