What is the value of the expression “eight more than three times the difference of four and a number” when n = 3?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

If f (x) = 2x2 +5/(x-2), complete the following statement: f(6) =

The roof of a farm silo is the shape of a hemisphere and is made of sheet tin. if the diameter of the silo is 126.5 feet, how much sheet tin is needed to make the roof? (use π = 3.1416.)