Which of the triangles at the right are similar? ΔXYZ and ΔABC

ΔXYZ and ΔPQR

ΔABC and ΔPQR

Which of the following expressions is equal to 2x^2+8

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.

Which of these triangle pairs can be mapped to each other using a single translation? cof hn