Write the first four terms of the sequence.an = 
n
A. a1 = 
, a2 = 
, a3 = 
, a4 = 
B. a1 = 1, a2 = 
, a3 = 
, a4 = 
C. a1 = 1, a2 = 
, a3 = 
, a4 = 
D. a1 = 
, a2 = 
, a3 = 
, a4 = 
Answer: D
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Solve the problem.A sample of 300 grams of radioactive substance decays according to the function 
where A(t) is the amount remaining after t years. How much of the substance will be left in the sample after 40 years? Round to the nearest whole gram.
A. 0 grams B. 1394 grams C. 1 gram D. 102 grams
Rewrite the fractions as equivalent fractions with the LCD.
and 
; 30
A. 
and 
B. 
and 
C. 
and 
D. 
and 
Solve.The population of Graham County is 839,777. The population of Broselow County is 261,217. The population of Irving County is 166,282. Find the difference in population between Graham County and Irving County.
A. 578,560 B. 673,495 C. 672,495 D. 578,660
Find the center, foci, and vertices of the ellipse.36x2 + y2 - 576x + 2268 = 0
A. (x - 6)2 + 
= 1
center: (6, 0); foci: (6, 3
), (6, -3
); vertices:(6, 8), (6, -8)
B. (x - 8)2 + 
= 1
center: (8, 0); foci: (8, 
), (8, -
); vertices:(8, 6), (8, -6)
C. 
+ (y - 6)2 = 1
center: (6, 0); foci: (6, 3
), (6, -
); vertices:(6, 8),
(6, -8)
D. 
+ (y - 8)2 = 1
center: (8, 0); foci: (8, 
), (8, -
); vertices:(8, 6), (8, -6)