1 fin = 8 grams
4 fins = 4 x 8 = 24 grams total
Start finding the slope of the line

using one of the points find the intercept and the standard form

the equation of the line is
80x70= y and then 400 - y= your answer! Ignore the four in. Deep part
The slope of the graph is 1/2
A = 1/2(8)(10) + 1/2(6)(8)
A = 40 + 24
A = 64
answer
64 in^2