My friend says 5 is 60 and 6 is b.
Take 2 points: (0, 70) (30, 80)
SLOPE FORMULA: y2 -y1 / x2 - x1
y2 - y1: 80 - 70 = 10
x2 - x1: 30-0 = 30
10 / 30
simplify: 1/3
This is a PROPER FRACTION
i think it 54 on the other side
37.5% = 3/8 as a fraction.
So 180 x 8/3 would get you your answer.
Solution: 480
First differences are all 7.3. You don't need a graph to know that is a linear function.