What is another way to write this 300 + 70 + 5\10 + 8\100

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?

If bradley saves for 4 weeks, what is the total amount of money he will have saved?

What is the slope-intercept from of the equation y+5=4(x+8)?