How many randomly selected adults must be surveyed to estimate the percentage of adults in the country who now use the Internet? Assume that you want to be 99% confident that the sample percentage is within 2 percentage points of the true population percentage and that you know nothing about the percentage of adults using the Internet.
A. 4,145 B. 2,401 C. 16,577 D. 613

W-16=-12 solve each one step equation plz

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.

Handsome jack is buying a pony made of diamonds. the price of the pony is p dollars, and jack also has to pay a 25% diamond pony tax. which of the following expressions could represent how much jack pays in total for the pony?