Answer: 
<u>Step-by-step explanation:</u>

For
ax^2+bx+c=0
discriminatn is b^2-4ac
a=4
b=12
c=9
discriinat is
12^2-4(4)(9)=
144-144
0
the discrminat is 0
I am to believe that his score was 70.
since mike scored 15 less than 85 i had suspected it was 70
I believe the answer is 2 if that’s an option
If you are cooking or in a lab and you are using measurements and you need to cut the recipe or compounds in half or double it you need to know how to do so