Which pair or pairs of polygons are congruent? A. 3 and 4 B. 1 and 3 C. 1, 3, and 4 D. 2, 3, and 4 E. 1, 2, 3, and 4

Could somebody me with this radical simplification?

Justin has 750 more than eva and eva has 12 less than justin together they have a total of 63 how much money did

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.