Construct the requested tree diagram.Use the tree diagram to count how many four-child families have two boys and two girls.
A. 6 families
B. 4 families
C. 2 families
D. 8 families
Answer: A
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Solve the problem.Find the centroid of a hemispherical shell having outer radius 10 and inner radius 5 if the density is constant.
A. 
= 0, 
= 0, 
= 
B. 
= 0, 
= 0, 
= 
C. 
= 0, 
= 0, 
= 
D. 
= 0, 
= 0, 
= 
Solve the problem.A pilot wants to fly on a bearing of 61.7°. By flying due east, he finds that a 59-mph wind, blowing from the south, puts him on course. Find the airspeed of the plane to the nearest mile per hour.
A. 124 mph B. 164 mph C. 55 mph D. 110 mph
Calculate the arc length of the indicated portion of the curve r(t).r(t) = (9cos3 4t)j + (9sin3 4t)k; 
? ? t ? 
?
A. 0
B. 
C. 27
D. 
Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.(5x)0
A. 1 B. 5 C. 5x D. 0