Find the angle between the given vectors, to the nearest tenth of a degree.a = 3i + 5j, b = -4i + 6j
A. 64.7°
B. 177.3°
C. 65.7°
D. 91.4°
Answer: A
Mathematics
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B. y ' = 
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Find a Cartesian equation for the curve described by the given polar equation.
r = 11sin?
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Solve the problem.The population of a particular country was 24 million in 1984; in 1994, it was 34 million. The exponential growth function 
describes the population of this country t years after 1984. Use the fact that 10 years after 1984 the population increased by 10 million to find k to three decimal places.
A. 0.230 B. 0.045 C. 0.670 D. 0.035
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Multiply, and then simplify if possible. Assume all variables represent positive real numbers.(
+ 
)(
- 
)
A. 3 - 2
B. 10
C. -4
D. 3 - 2
Mathematics