Which equation has solutions at (3,4)? (Answer choices are on the attached file I couldn't figure out how to type them on my keyboard)

Asalesperson earns $320 per week plus 8% of her weekly sales. the expression representing her earnings is 320 + 0.08x. which of the following describes the sales necessary for the salesperson to earn at least $1000 in the one week?

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

If np3 /nc2 = 6, find the value of n