Brianna took a math test with 20 questions and she answered 16 questions correctly. in order to get an a, she needs to answer at least 90 percent of the questions correctly.

your mission, should you decide to accept it, is to tell me if brianna got an a on this math test? explain why or why not, and if she didn't get an a, how many questions would she need to answer correctly to get an a? show your work

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional