Find the exact value of the expression.sin 20° cos 100° + cos 20° sin 100°
A. 
B. 
C. - 
D. - 
Answer: B
Mathematics
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Find an equation for the sphere with the given center and radius.Center (0, -9, -6), radius = 4
A. x2 + y2 + 4z2 + 18y + 12z = -101 B. x2 + y2 + z2 + 18y - 12z = -101 C. x2 + y2 + z2 + 18y + 12z = -101 D. x2 + y2 + 4z2 + 18y - 12z = -101
Mathematics
Solve the problem. Round your answer to three decimals.What annual rate of interest is required to triple an investment in 7 years?
A. 16.993% B. 8.497% C. 10.409% D. 15.694%
Mathematics
Find f(x) = a(x - h)2 + k so that f models the data exactly.
A. f(x) = -2(x + 2)2 + 5 B. f(x) = -(x - 2)2 + 5 C. f(x) = (x + 2)2 + 5 D. f(x) = -2(x - 5)2 + 2
Mathematics
Find the logarithm. Give an approximation to four decimal places.ln (5.15 × 1018)
A. 1.6390 B. 29.5020 C. 43.0855 D. 4.5294
Mathematics