Solve the problem.A sample of 600 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 30 years? Round to the nearest whole gram.
A. 2947 g
B. 0 g
C. 1 g
D. 204 g
Answer: D
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Solve the problem by integration.The force F (in N) applied by a stamping machine in making a certain computer part is 
where x is the distance (in cm) through which the force acts. Find the work done by the force from 
to 
A. 0.3168 N? cm B. 11.5907 N? cm C. 0.0222 N? cm D. 0.1334 N? cm
Find dy.y = cos(9
)
A. 
dx
B. 
dx
C. 
dx
D. 
dx
Use the unpaid balance method to find the finance charge on the credit card account. The last month's balance and any other transactions are given.Month: April (30 days)Previous month's balance: $490Interest rate: 20%
A. $9.95 B. $14.52 C. $7.45 D. $597.17
Graph the circle. Identify the center.(x - 2)2 + (y + 1)2 = 16
A. center: (2, -1)
B. center: (- 2, 1)
C. center: (- 2, 1)
D. center: (2, -1)