Lessons on Modeling Linear Relationships

 In order to join an online learning community,
there is a $20 startup fee
and a $5 monthly fee. 
Select the linear model that represents a members total cost (y) for x months.

• y = 20x + 5
• y = 5x +20

Charlie rented a moving truck. He paid a daily fee plus a per-mile fee to rent the truck. The equation below is a model for  the daily amount Charlie paid for the truck if he drives it x miles.
y=0.5x+10
What does the slope of the graph of this model  represent?

• The daily fee for the moving truck
• The per-mile fee for the moving truck
• How much Charlie paid for the truck
• The number of miles he drove

A fitness club opens with 80 members. Each month the membership increases by 15 members. Select the linear model that represents the relationship between the number of months the club has been opened, x, and the total fitness club membership, y?

• y=15x
• y=15x+80
• y=x+15
• y=80x+15

The GPA of a student can be predicted using the equation
y = 1.4 x + 1.4  where x is the hours the student spends studying.  How many hours did a student spend studying if they have a GPA of 4.2?

• 4
• 3
• not enough information
• 2

This is Alondra's new pool.
Create a function model and find the total area for her new pool.
Round to the nearest whole number.

• 1990
• 1991
• 1745
• 1500

   -16t² + 90t +120 
This is the model that shows the height of a ball after t seconds.
What kind of function model is this?

• linear
• exponential
• square root
• quadratic