Question

ow! your dedication is blazing!
an electric company charges a certain rate per kilowatt-hour (kwh) of electricity used and an administrative fee of $3.50. the company charged zhao $63.25 for using 800 kwh of electricity.
zhao uses the equation, $63.25 = 800r + 3.50$ to represent the situation.
what does the variable $r$ represent in the equation?
choose 1 answer:
a the number of kilowatt-hours zhao used
b the charge per kilowatt-hour

Explanation:

In the equation \( 63.25 = 800r + 3.50 \), the total cost (\(63.25\)) is the sum of the cost for the electricity used and the administrative fee (\(3.50\)). The term \(800r\) represents the cost for the electricity used, where \(800\) is the number of kilowatt - hours (kWh) used. If we think about the formula for cost (Cost = Rate×Quantity), here the quantity of electricity is \(800\) kWh, so \(r\) should represent the rate (charge) per kilowatt - hour. Option A is incorrect because the number of kilowatt - hours used is \(800\), not \(r\).

Answer:

B. The charge per kilowatt - hour