1. Amanda is putting money into a checking account. Let y represent the total amount of money in the account (in dollars). Let x represent the number of weeks Amanda has been adding money. Suppose that x and y are related by the equation .y=350+20x

Answer the questions below. Note that a change can be an increase or a decrease.

For an increase, use a positive number. For a decrease, use a negative number.

a. What is the change per week in the amount of money in the account?

b.What was the starting amount of money in the account?

2.The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes). The remaining credit after 34 minutes of calls is $15.58 , and the remaining credit after 73 minutes of calls is $10.51 . What is the remaining credit after 109 minutes of calls?

3.A plant is already 42 centimeters tall, and it will grow one centimeter every month. The plant's height, H (in centimeters), after m months is given by the following function.

H(m)=42+m

What is the plant's height after 27 months?