PLEASEE HELP MEEE WITH QUESSTIONNSS 7 AND 8

QUESTION: (IT IS IN BOLDED WHICH IS SHOWN IN THE PICTURE)

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

What are the equivalent ratios for 24/2= /3= /5.5=108/ = /15