I need an explanation on how to do this and an answer, please.

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?

Find a third-degree polynomial equation with rational coefficients that has roots -2 and 6+i

The dimension of the rectangular pool shown below are 40 yards by 20 yards