What is the sum of 4x and 3

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?

What integer is equivalent to 9 3/2

The sum of two consecutive mile markers on the interstate is 417417. find the numbers on the markers