How do you do this and explain it to me if you can

What is the result of converting 60 ounces to pounds remember there are 16 ounces in a pound

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.

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.