Help me, answer if you know also pls don’t waste my points

How can we find the measure of an exterior angle if we know the measurement of an interior angle

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 domain and range of the following function f(x) = 51x - 21+ 4