Solve the problem.Find the center of mass of a tetrahedron of density 
bounded by the coordinate planes and the plane 
.
A. 
= 
, 
= 
, 
= 
B. 
= 
, 
= 
, 
= 
C. 
= 
, 
= 
, 
= 
D. 
= 
, 
= 
, 
= 
Answer: B
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Solve the problem.A twin-engined aircraft can fly 768 miles from city A to city B in 3 hours with the wind and make the return trip in 8 hours against the wind. What is the speed of the wind?
A. 112 mph B. 80 mph C. 96 mph D. 64 mph
Find the inverse of the function.f(x) = (x - 4)2, x ? 4
A. f-1(x) = -
+ 4, x ? 0
B. Not a one-to-one function
C. f-1(x) = 
+ 4, x ? 0
D. f-1(x) = 
, x ? 4
Answer the question.f(x) = 
Does 
f(x) exist?
A. No B. Yes
Solve the problem. Use 3.14 for ?. Round your answer to the nearest hundredth.Cindy wants to secure sequins on a piece of felt shaped like a trapezoid with a height of 8 cm and bases of 15 cm and 9 cm. What is the cost of all the sequins if sequins cost $0.80 per cm2 of coverage?
A. $32.00 B. $25.60 C. $76.80 D. $82.80