What is the advantage of reducing process variation, thereby causing process control limits to be at a greater number of standard deviations from the mean

Anyone know? will mark brainliest if you're correct!

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

The first floor of marcus’ house is 1,440 square feet. he will cover 1,033 square feet with wood and the rest with tile. a box of tiles will cover 11 square feet. how many boxes of tile does marcus need to buy to cover the floor?