Use a calculator to perform the operation. Express your answer in scientific notation.
A. 2.87 × 1027
B. 2.865657742 × 1027
C. 6.62 × 101
D. 2.87 × 1025
Answer: A
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If ?t is increased by 1, then 
is decreased by what percentage?
?
A. 85% B. 15% C. 0.85% D. 0.15%
A cleaning process is removing salt from a pool. The amount S, in pounds, of salt remaining after t hours is given in the following table. Use exponential regression to determine the amount of salt remaining after 19.82 hours. Round your answer to two decimal places. t 1.54 5.04 8.82 12.81 15.82 S 20.73 11.71 6.58 3.46 2.92?
A. 4.60 pounds B. 1.54 pounds C. 6.18 pounds D. 2.66 pounds
Write the binomial expansion of the expression.
3
A. 
x3 + 
x2 + 16x + 64
B. 
x3 + 
x2 + 64
C. 
x3 + 
x2 + 16x + 64
D. 
x6 + 
x3 + 64
Factor completely. If the polynomial cannot be factored, write "prime."4x2 - 5x + 9
A. (4x - 1)(x - 9) B. (4x - 9)(x - 1) C. prime D. (2x - 9)(2x - 1)