HELP!!!
example: The Motorola phone company has many different plans. The Choice plan has a basic charge per month, which includes a certain amount of free data. There is a charge for each additional GB of data. The piecewise function below gives John’s bill cost, f(x), of monthly phone usage. What is the cost of a phone bill if John uses 4GB of data for the month
f(x) =
40 when x ≤ 5GB
40 + 12 (x ― 5) when x > 5

Q.1: Using the piecewise function above, find the bill for John if he uses 8GB of data.

Q2: John was also presented an Unlimited plan that is $100 per month. If on average he uses 9GB of data per month, is it worth it for him to sign up for the unlimited plan? How many GB of data is needed for it to break even with the unlimited plan?

Q3. Tru-Text charges $19 for a texting plan with 250 text messages included. If the customer goes over the 250 messages, the cost is $0.18 per text message. They also have an unlimited plan which costs $45 per month.
() = { 19, ℎ ≤ 250
19 + 0.12( ― 250), ℎ > 250
For what number of text messages are the costs of the two
different plans the same? Round to the whole number.