HELP PLZ Show your mathematical thinking and record your work with a final answer.

A parallelogram has vertices (5,0), (3, -3), (-4, -3) and (-2, 0) The diagonals of the parallelogram intersect at their midpoints.

A. What are the coordinates of the intersection of their diagonals? Justify the answer algebraically.

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.