T(d) is a function that relates the number of tickets sold for a movie to the number of days since the movie was released. the
average rate of change in t(d) for the interval d = 4 and d = 10 is 0. which statement must be true?

a. the same number of tickets was sold on the fourth day and tenth day.

b. no tickets were sold on the fourth day and tenth day.

c. fewer tickets were sold on the furth day than on the tenth day.

d. more tickets were sold on the fourth day than on the tenth day.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.