0.000387 in scientific notation

Suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet.

Having a hard time understanding this question (see attachment).

For the feasibility region shown below find the maximum value of the function p=3x+2y