How do i solve this by substitution?

Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

The approximate line of best fit for the given data points, y = −2x − 2, is shown on the graph.which is the residual value when x = –2? a)–2 b)–1 c)1 d)2

If f(x) = -5x + 1 and g(x) = x3, what is (gºf)(0)? enter the correct answer