Explain how to use estimation to find the product of two decimals. give an example with both estimated and actual answers

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.

What is the measure of one interior angle of a pentagon

Sara made $253 for 11 hours of work. at the same rate how much would he make for 7 hours of work?