Solve the problem.A box has dimensions 2" × 3" × 4". (See illustration.) 
Determine the angle ? formed by the diagonal of the 2" × 3" side and the diagonal of the 3" × 4" side. Round your answer to the nearest degree.
A. 65°
B. 50°
C. 60°
D. 62°
Answer: C
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Find the mass of the wire that lies along the curve r and has density ?.C1: r(t) = (3 cos t)i + (3 sin t)j, 0 ? t ? 
;C2: r(t) = 3j + tk, 0 ? t ? 1; ? = 3t3
A. 
units
B. 
units
C. 
?3 units
D. 
?3 units
Use a sum or difference identity to find the exact value.
A. - 
B. - 
C. -2
D. - 
Solve.2(x + 5) + 9 = 4(x + 3) + 11
A. 8 B. 12 C. 4 D. -2
Solve the problem.A ball is thrown vertically upward with an initial velocity of 160 feet per second. The distance in feet of the ball from the ground after t seconds is 
For what intervals of time is the ball less than 384 above the ground (after it is tossed until it returns to the ground)?
A. between 0 and 3.5 seconds and between 6.5 and 10 seconds B. between 4 and 6 seconds C. between 0 and 4 seconds and between 6 and 10 seconds D. between 0 and 4.5 seconds and between 5.5 and 10 seconds