What is this ratio in simplest form?

16:64

A.1:4
B.2:8
C.4:1
D.8:32

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

Mia’s gross pay is 2953 her deductions total 724.15 what percent if her gross pay is take-home pay

Trying to figure out the standard form equation for this graph