how do i make h the subject of this formula ? t = gh / 10

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?

What is the value of x in the following equation. -x ^3/2 = -27

Which system of linear inequalities is represented by the graph?