6x=108 if x=8 is it true or false

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52