In the picture below, what is the approximate area that is shaded blue?

a.
38 in2

b.
77 in2

c.
79 in2

d.
157 in2

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days