Solve the problem.Suppose that the amount in grams of a radioactive substance present at time t (in years) is given by A(t) = 670e-0.81t. Find the rate of change of the quantity present at the time when 
A. 5 grams per year
B. -5 grams per year
C. -107.4 grams per year
D. 107.4 grams per year
Answer: C
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Solve the problem.Use series to estimate the integral's value to within an error of magnitude less than 10-3.
A. 0.1022 B. .05133 C. .3204 D. 0.1000
Solve the problem.A cyclist bikes at a constant speed for 17 miles. He then returns home at the same speed but takes a different route. His return trip takes one hour longer and is 22 miles. Find his speed.
A. 6 mph B. 4 mph C. 7 mph D. 5 mph
Find a power function that models the data in the table. Round to three decimal places if necessary.
A. y = 4.104x0.742 B. y = 5.887x1.155 C. y =0.742x4.104 D. y = 1.935x + 3.53
Determine whether the function is even, odd, or neither.f(x) = (x + 5)(x + 9)
A. Even B. Odd C. Neither