Eighteen is 60% of what number?

18 = 0.6n
18/0.6 = n
30 = n

OR you could use fractions...
18/n = 60%/100%
18/n = 3/5
Cross Multiply Then Divide...

18*5/3 = n
to get n = 30

You could find out 1% = 18 ÷ 60 = 0.3
100% = 100 x 1% = 100 x 0.3 = 30
the answer is 30

Ithink if im not mistaking b is -3 but im not a 100% sude

The correct graph is the second one, with the points being at (-6,0), (2,0) and reaching down to (-2,-8)