Stuck on Two Word Problems/ Functions

1."The combination of cold temperatures and wind speed determine what is called wind chill. The wind chill is a temperature that is the still-air equivalent of the combination of cold and wind. When the Wind speed is 25mph, the wind chill depends on the temperature t (in degrees Fahrenheit) according to

WC= 1.479t - 43.821

For what temp does it feel at least 30 degrees colder than teh air temp? That is, find t such that WC <=(less than or equal to) t -30

Don't really have any idea on how to do that one, I tried graphing it on my graphing calcualtor but just confused myself.

2. A shipping crate has a square base with sides of length x feet and it is half as tall as it is wide. If the material for the bottom and sides of the box cost 2$ per sqr foot and the material for the top cost 1.50 per sqr ft., express the total cost of materials for the box as a function of x.

So I know the length = x and the height = .5x

So the area of the sides is x(.5x) times 4 would give me the area for the sides in sqr feet? and to do the bottom I'd just do x times x and the same with the top? I'm not sure hwo to put it all together though