Use the digits 0-9 to write an expression with a value as close as possible to 4. Each digit can be used only one time in the expression.

( [a] + [b] + [c] + [d]) divided by 4

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

What number gives you a irrational number when added to 2/5

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.)