If f(x) = [x] - 5, what is f(8.6)?

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

The acceleration of an object due to gravity is 32 feet per second squared.what is acceleration due to gravity in inches per second squared?

Aladder that is 20ft long is leaning against the side of a building. if the angle formed between the ladder and the ground is 75 degrees how far is the bottom of the from the base of the building?