Subract the childs age in years from 30 then divide the result by 2 shes 10 years old
wakes up at 7am
what time does she go to sleep??

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Abcd is a square. what is the measure of angle bac

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.