What is the shortcut of finding a 3×3 matrices in inverse method​

Write an algebraic expression for the word expression the quotient of c and 8

Complete the table for different values of x in the polynomial expression -7x2 + 32x + 240. then, determine the optimal price that the taco truck should sell its tacos for. assume whole dollar amounts for the tacos.

Can someone check if i did this correct. it’s number 4 if you’re wondering.