In 1998, the number of newly reported cases of tuberculosis (TB) was about 21,210 and decreased by about 4.73% each year from 1998 to 2002. Write an exponential decay model giving the number of newly reported cases of TB y (in thousands),t years after 1998. All I know how to do is A = 21,210 D:

An eight-sided die, which may or may not be a fair die, has four colors on it; you have been tossing the die for an hour and have recorded the color rolled for each toss. what is the probability you will roll a brown on your next toss of the die? express your answer as a simplified fraction or a decimal rounded to four decimal places.

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?