Could someone please help me with these 5 problems it’s very important. The photo is attached right here and please don’t answer if you don’t know how to do it, thank you.

Write an inequality and solve each problem.for exercises 11 and 12, interpret the solution.

Find the quotient with the restriction.

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.