SOMEONE JUST TOLD ME IM GOING TO HELL ON THIS APP LMA00

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

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

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