Zoe ate 4 chocolates each night and after 3 nights there were 12 chocolates remaining in the box. Write an equation for c in terms of t representing the number of chocolates remaining in the box t days after zoey birthday

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

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.

Simplify using positive exponents only.