3 Questions

1. Electrical Rates Electrical service costs $8 per month plus $0.10 per kilowatt-hour of electricity used. (Assume that a partial kilowatt-hour is not rounded up.)

(a) If the resident of an apartment uses 650 kilowatt hours in 1 month, what is the charge?

(b) Write an equation in slope-intercept form that gives the cost C of using x kilowatt-hours in 1 month.

(c) If the monthly electrical bill for the apartment's resident is $43, how many kilowatt-hours were used?

2. How can you tell visually whether two lines are parallel?  How can you tell by looking at their equations and not their graphs?

How can you tell visually whether two lines are perpendicular?  How can you tell by looking at their equations and not their graphs?

3. What are the differences among expressions, equations, and functions? Provide examples of each.