I need help again plz

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

Arestaurant offers delivery for their pizzas. the total cost the customer pays is the price of the pizzas, plus a delivery fee. one customer pays $23 to have 2 pizzas delivered. another customer pays $59 for 6 pizzas. how many pizzas are delivered to a customer who pays $86?

Given the equation    = 5, solve for x and identify if it is an extraneous solution