Help me with mathematics please

What are the steps to solving the inequality 3b + 8 ≥ 14?

Acylinder has volume 45π and radius 3. what is it’s height?

Steve wants to develop a way to find the total cost of any item including sales tax. the sales tax in his city is 6%. his friend jenna writes the expression x + 6x where x is the cost of the item. explain whether her expression is correct based on the situation.