Which of these is a mathematical expression? A

B

4 - 3r

C

4 - 3r = 1

D

"Happily ever after"

PLEASE HELP ITS ON A QUIZ AND ITS DUE IN TEN MINUETS

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?

Given the diagram below, michael writes, "segment ac is congruent to segment ac." which of the following reasons allow him to write this statement?