Find the exact value of the expression.sin 20° cos 40° + cos 20° sin 40°
A. 
B. 
C. 
D. 
Answer: B
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Find the linear approximation of the function at the given point.
at 
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B. 
C. 
D. 
Solve the problem.The square root expression Rf
gives the aging rate of an astronaut relative to the aging rate of a friend on Earth, Rf, where v is the astronaut's speed and c is the speed of light. An astronaut is moving at 60% of the speed of light. Substitute 0.6c in the expression above. What is his aging rate, correct to two decimal places if necessary, relative to a friend on Earth?
A. 0.63Rf B. 0.8Rf C. 0.8 D. 1.17Rf
Estimate the answer by rounding as indicated.Estimate by rounding to the leftmost digit.
A. 8201 B. 8700 C. 8200 D. 8210
Factor completely. If the polynomial is prime, state so.48x3 - 32x5 - 18x
A. prime B. 2x(4x2 + 3)(4x2 - 3) C. -2x(4x2 + 3)2 D. -2x(4x2 - 3)2