Which of the following situations can be modeled by the equation? m=7.71(0.9333)^t
A. A radioactive decay of 93.33% per years for a block of plutonium-238 that has an initial mass of 7.71 grams.
B. A radioactive decay of 7.71% per year for a block of plutonium-238 that has an initial mass of 93.33 grams.
C. A radioactive decay of 92.29% per years for a block of plutonium-238 that has and initial mass of 93.33 grams.
D. A radioactive decay of 6.67 per year for a block of plutonium-238 that has an initial mass of 7.71 grams.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)