The question is in the image! Thanks for helping me it means alot to me.

Astudent simplified a rational expression as shown.

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

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b