How do you use an exponent to represent a number such as 81?

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Miguel’s teacher asks him to color 4/8 of his grid. he must use 3 colors: red, blue, and green. there must be more green sections than red sections. how can miguel color all the sections of his grid to follow all the rules

Evaluate the expression. (9 + 5)(3 + 2)0