0.8 -0.50 3 with solution​

The depth of a lake at a certain point, wich is a function of the distance of that point from shore, is 30 feet.

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

A3-dimensional figure has a square base and 4 lateral faces that meet at a point. explain the difference between the cross sections when a slice is made perpendicular to the base through the vertex, and when a slice is made perpendicular to the base and not through the vertex