Let f(x)=x^2-3x+5. find the average rate of change from x=-3 to x=0

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

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Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.