What is halfway between 5.55 and 5.6

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

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

2f(x)= x+3 if 4 < x < 8 2x if x 28 2