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
Answer: B
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Which of the following can be used to find the experimental probability when spinning a spinner? ?
A. ?Many repetitions of spinning. B. ?Collecting data on spin results. C. ?Finding the percent of times that arrow lands on specific colors. D. ?Using a computer random number generator to simulate spins. E. ?All of the above.
Use differentiation to determine whether the integral formula is correct.
dx = -x cos x + sin x + C
A. No B. Yes
If the function is one-to-one, find its inverse. If not, write "not one-to-one."f(x) = 
, x ? 7
A. f-1(x) = 
B. f-1(x) = x2 + 7, x ? 0
C. not a one-to-one
D. f-1(x) = (x - 7)2
Use the right triangle in the illustration and the Pythagorean theorem to find the unknown side.k = 30.2 mi, l = 41.1 miThe unknown side m is _____ mi.
A. 51.0 B. 30.4 C. 27.9 D. 41.2 E. 71.3