You are given the graph of a function f. Determine the intervals where f is concave downward.
?
?
A. 
B. ?
C. ?
D. ?
Answer: A
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Solve.An above-ground pool is shaped like a cylinder with a radius of 10 ft and a depth of 3 ft. How many cubic feet of water can the pool hold? Give an exact answer in terms of ?.
A. 300 ft3 B. 30? ft3 C. 300? ft3 D. 100? ft3
Solve the problem.A giant sequoia is measured to have a circumference of 19.3 meters. What is the diameter to the nearest hundredth? (Use 3.14 to approximate ?.)
A. 3.07 m B. 6060.2 m C. 61.46 m D. 6.15 m
Write the function in the form 
or 
. Find the period and phase shift.y = 5 sin (?x - 9)
A. y = 5 sin
period = ?; phase shift = 9
B. y = 5 sin
period = 5; phase shift = - 
C. y = 5 sin
period = 2; phase shift = 
D. y = 5 sin
period = 2; phase shift = 9
Solve.The number of books in a small library increases according to the function B = 2600e0.02t, where t is measured in years. How many books will the library have after 5 years?
A. 5987 B. 2600 C. 2873 D. 3273