Help me wit math questions pls

The table represents a linear function. what is the slope of the function? –6 –4 4 6

Television sizes are based on the length of the diagonal of the television's rectangular screen. so, for example, a 70-inch television is a television having a diagonal screen length of 70 inches. if a 70 inch television's diagonal forms a 29°angle with the base of the screen, what is the vertical height (1) of the screen to the nearest inch? 70 inhin

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x