F = 
express the equation with F on the left side
3F - 24 = s ( add 24 to both sides )
3F = s + 24 ( divide both sides by 3 )
F = 
Answer:
10
20
Step-by-step explanation:
correct c=3 x 10
incorrect i=-1
-------
incorrect= 10
number of questions= 10+10= 20
The answer would be $51.36
48.00 x 7% = 3.36
48.00 + 3.36 = $51.36
150=i^2
150^.5=12.2474
11^2=121
12^2=144
13^2=169
between 12 and 13, D