What layer is mesosphere plus thermosphere

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

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.

One positive integer is 2 less than another. the product of the two integers is 24. what are the integers