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)
Answer: C
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The triangles are similar. Find the missing side, angle or value of the variable.?B
a = 7 cmb = 65°
A. 65° B. 7 cm C. 85° D. 30°
Find the third derivative of the function.
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A. ?
B. ?
C. ?
D. ?
E. ?
Write a linear inequality in two variables to represent the situation.A freight elevator has a limit of 5250 pounds. Suppose x crates of plastic parts, each crate weighing 900 pounds, and y crates of metal parts, each crate weighing 1050 pounds, are to be placed on the elevator. Write a linear inequality that describes the options for the number of crates of each type.
A. 900x + 1050y ? 5250 B. 900x + 5250y ? 1050 C. 900x + 1050y ? 5250 D. 1050x + 900y ? 5250
Solve the problem. Round to two decimal places if needed.The minute hand of a clock is 8 inches long. How far does the tip of the minute hand move in 50 minutes?
A. 41.89 inches B. 43.12 inches C. 44.4 inches D. 40.15 inches