Evaluating and Interpreting Functions

Which value is the y-intercept in the equation:

y= 2x -2

• 2

• -2

• 1

State the range of the following relation:

• {(7, 3), (8, -1), (10, 0), (13, 4)}

• {7, 8, 10, 13}

• {-3, -1, 0, 4}

• (13, 4)

The amount in dollars an electrician charges in terms of the number of hours worked is given by the function y = 22x + 42. Which statements below are true? Choose two.

• The electrician charges an initial fee of $22.

• The electrician charges an initial fee of $42.

• The electrician charges $22 per hour.

• The electrician charges $42 per hour.

Sandra has a $20 itunes gift card and spends $3 each month.  Which equation can be used to find how much money Sandra has on her giftcard after x months?

• y = 3x + 20

• y = 3 + 20x

• y = -3x + 20

• y = -20x + 3

Which equation shows the number of bottles left after x days?
A family buys a case of water with 48 bottles and drinks 5 bottles per day.

• y = 48x + 5

• y = -5 + 48x

• y = -5x - 48

• y = 48 - 5x

According to the graph, at what speed is this car traveling in miles per hour?

• 80 mph

• 20 mph

• 40 mph

• 160 mph

What is the rate of change demonstrated in this graph?

• 2 cm per hour

• ¹/₄ cm per hour

• ¹/₂ cm per hour

• 4 cm per hour

What does the rate of change represent in this situation?

• The sloth runs 1 feet in 3 minutes

• The sloth runs 3 feet in 1 minute

• The sloth runs fast

• The sloth runs 6 feet in 1 minute

List the types of intervals that the graph demonstrates in order.

• decreasing, constant, increasing, constant

• increasing, decreasing, constant

• increasing, constant, increasing, constant

• increasing, constant, decreasing, constant

Which statement is true about this function?

• The function is never constant

• The function is always increasing

• The function is never decreasing

• The function increases at the same rate between the interval x=11:00 and x=13:00