Polygon ABCDE is the first in a pattern for a high school art project. The polygon is
transformed so that the image of A' is at (-4, 2)
and the image of D' is at (-2, 1). Which
transformation can be used to show that
ABCDE and its image are congruent?
A. Rotate ABCDE 90° counterclockwise.
B. Translate ABCDE left 4 units and down 2
units.
C. Reflect ABCDE over the x-axis.
D. Rotate ABCDE 90° clockwise.

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.