Solve.The function A = A0e-0.0077x models the amount in pounds of a particular radioactive material stored in a concrete vault, where x is the number of years since the material was put into the vault. If 800 pounds of the material are initially put into the vault, how many pounds will be left after 40 years?
A. 900 lb
B. 168 lb
C. 588 lb
D. 178 lb
Answer: C
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Is the function graphed one-to-one?
A. No B. Yes
Solve the problem.The population of a small country increases according to the function B = 2,300,000e0.02t, where t is measured in years. How many people will the country have after 3 years?
A. 2,810,252 people B. 2,442,224 people C. 6,470,845 people D. 2,640,753 people
Find the center, foci, and vertices of the ellipse.9x2 + y2 - 162x + 720 = 0
A. 
+ (y - 9)2 = 1
center: (9, 0); foci: (9, 2
), (9, -2
); vertices:(9, 3), (9, -3)
B. (x - 9)2 + 
= 1
center: (9, 0); foci: (9, 2
), (9, -2
); vertices:(9, 3), (9, -3)
C. 
+ (y - 3)2 = 1
center: (3, 0); foci: (3, 4
), (3, -2
); vertices:(3, 9),
(3, -9)
D. (x - 3)2 + 
= 1
center: (3, 0); foci: (3, 4
), (3, -4
); vertices:(3, 9), (3, -9)
Add or subtract.
+ 
A. 
B. 
C. 
D. 