Someone help me solve this please, I'd appreciate it if you can walk me through the steps. If not, just answering it is okay! :)

What is the inverse of the function f(x)=4x+8

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a.the profit when the unit price is equal to 0b.the unit price(s) when the profit is equal to 0c.the profit when the unit price is greatestd.the unit price(s) when profit is greatest

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction