Write an equivalent expression for 7a + 21

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

Write 37/22 as a decimal rounded to the nearest hundredth.

Fracisco's game involves 3 green, 2 yellow, 4 red, and 3 black marbles. if he randomly draws three marbles from the bag, without replacement, what is the probability that he will draw yellow, and then red, and then black? a)1/192 b)1/72 c)3/220 d)1/55