Ineed on the question and i need to do it because i’m on a time schedule

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

What is the ratio fraction form of 25: 9

The salesperson earns a 5% commission on the first $5,000 she has in sales. the salesperson earns a 7.5% commission on the amount of her sales that are greater than $5,000. this month the sales person had $8,000 in sales. what amount of commission, in dollars, did she earn?