Victoria recently switched to a new electric company. if she uses between 0 and 400 kilowatt-hours (kwh) of electricity per month, the cost is a set price of $30. if she uses 400 kwh or more per month, the price is $0.097 per kwh.

see the explanation

Step-by-step explanation:

The question is

Identify the domain and the range, using words and inequalities

Let

x -----> the number of kilowatt-hours (kWh) of electricity per month

y ----> the price per month

we know that

Part 1) For the value of x between 0 kWh and 400 kWh

The price is equal to

therefore

The domain is the interval ------> [0,400)

The domain is all real numbers greater than or equal to 0 kWh  and less than 400 kWh

The range is ($30)

The range is equal to $30

Part 2) For the value of x equal to 400 kWh or more per month

The domain is the interval -----> [400, infinite)

The domain is all real numbers greater than or equal to 400 kWh

The price is

Find the range

For x=400 kWh

so

The range is the interval -----> [38.8, infinite)

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50

is should be y = 5x

step-by-step explanation:

correct me if im wrong