Solve.
= 8
A. 65
B. 64
C. 81
D. 63
Answer: D
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Calculate the arc length of the indicated portion of the curve r(t).Following the curve r(t) = 5ti + (12 cos t)j + (12 sin t)k in the direction of increasing of arc length, find the point that lies 39? units away from the point where 
A. (15?, 0, 0) B. (15, -12, 0) C. (15?, -12, 0) D. (15?, 0, -12)
Solve the problem by using addition, subtraction, multiplication, or division as needed.A school bookstore ordered 223 copies of an English textbook. If the total cost was 
, find the cost of each book.
A. $20 B. $4683 C. $15 D. $22
One period of the given function is defined below. Determine whether the function is even, odd, or neither.
A. Even B. Neither C. Odd
Solve the problem.Persons taking a 30-hour review course to prepare for a standardized exam average a score of 620 on that exam. Persons taking a 70-hour review course average a score of 772. Find a linear function, S(t), which fits this data, and which expresses score as a function of time. Use this function to predict an average score for persons taking a 51-hour review course. Round your answer to the tenths place.
A. 692.5 B. 713.8 C. 704.0 D. 699.8