Solve the problem.An explosion causes debris to rise vertically with an initial velocity of 4 feet per second. The function 
describes the height of the debris above the ground, s(t), in feet, t seconds after the explosion. What is the instantaneous velocity of the debris 3.3 second(s) after the explosion?
A. -105.6 feet per second
B. -41.6 feet per second
C. 41.6 feet per second
D. 105.6 feet per second
Answer: B
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Solve the problem.A glass has circular cross sections that taper (linearly) from a radius of 7 cm at the top of the glass to a radius of 6 cm at the bottom. The glass is 14 cm high and full of lemonade. How much work is required to drink all the lemonade through a straw if your mouth is 8 cm above the top of the glass? Assume the density of lemonade equals the density of water. Round to two decimal places when appropriate.
A. 2.67 J B. 3.8 J C. 0.85 J D. 48.71 J
Solve the problem.Assume that from 1930 to 1980, the number of deaths from lead poisoning (per 100,000 people) decreased dramatically and could be modeled by 
where x is the year. Determine when, to the nearest year, this death rate was 75 or less by graphing y = f(x) and 
in 
by [0, 200, 25].
A. 1964 or after B. 1960 or after C. 1973 or after D. 1967 or after
Solve the problem.Peter must practice the piano 
per week. He has already practiced 
How many more hours does he need to practice?
A. 7
hr
B. 1
hr
C. 6
hr
D. 1
hr
Find the derivative of the function.
?
?
A. 
B. 
C. 
D. 