15.12 Hello. I struggle with some math concepts, and I was wondering if anyone could help me with this question, please? Thank you kindly.

Determining the wind speed at which an object becomes airborne or moves laterally is a very complicated problem. Nonetheless, engineers have devised formulae to provide rough estimates for the threshold wind speeds. For many objects, one formula that provides reasonable estimates is

\fObject Weight (1b) Exposed Surface Area (ft2) 3/4-inch sheet of plywood 90 32 human being (standing) 200 5 single brick 3 0.2 concrete block 40 0.8 automobile 4000 60