Simplify 8 to the -5th power over 8 to the -3rd power

Solve |2x - 5| = 4 if anyone could , that would be great

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.

How to solve a simultaneous equation involved with fractions?