A bacterial colony is growing on the dish such that the density of bacteria at a distance x from the y-axis is (3x + 1) mg/in2 . How many mg of

A bacterial colony is growing on the dish such that the density of bacteria at a distance x from the y-axis is (3x + 1) mg/in2 . How many mg of bacteria are on the dish? 4. On an experimental plate the region bounded between y = x2 and the line y = -x that is also between x = 0 and x = 4 cm is sprayed with a chemical. The density of the chemical is 3 ng/cm2 . How much chemical is on the plate?