If y = 3x and x = 2 then y = 6 is this substitution property

Avegetable garden and a surrounding path are shaped like a square together are 12 ft wide. the path is 1 feet wide. if one bag of gravel covers 8 square feet, how manu bags are needed to cover the path? round your answers to the nearest tenth.

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

If value of cos330° is √3/2 then find tan165°.