Will fan and medal! identify the transformations that describe the graph of an even function select all that apply.
1.) reflection over the x axis
2.) reflection over the y axis
3.) reflection of the line y = x
4.) 90° rotation around the origin
180° rotation around the origin

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.