PC Lesson 2.1.1 Practice

What is the definition of a function?

• Has inputs and outputs
• Every input has only ONE output
• Inputs have different outputs every time
• x-values and y-values

Is the relation a function? Why.

• Yes, because the x-value 11 has two y-values pair with it.

• Yes, because each x-value has only one y-value paired with it.

• No, because the x-value 11 has two y-values pair with it.

• No, because each x-value has only one y-value paired with it.

For the function {(0,1), (1,-3), (2,-4), (-4,1)}, write the domain and range.

• D: {1, -3, -4,}
  R: {0, 1, 2, -4}
• D:{-4, 0, 1, 2}
  R:{-4, -3, 1}
• D:{0, 1, 2, 3, 4}
  R:{1, -3, -4}

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

What best describes the increasing/decreasing of the graph?

• decreasing, increasing

• decreasing, increasing, decreasing

• increasing, decreasing, increasing

• increasing, decreasing

When is the function decreasing?

• (30, 55)

• (40, 60]

• (15, 40)

• (60, -40)

When is this function increasing?

• (-2.5, 2.5)

• [-3, 3]

• (3, ∞)

Where is the function positive?

("positive" or "negative" refers to the value of the outputs... that is different than "increasing" or "decreasing")

Is the graph increasing or decreasing?

• Increasing

• Decreasing

• Both; increasing if x < 3, and decreasing is x > 3

• Both; decreasing if x < 3, and increasing is x > 3

Identify where the function is increasing and where it is decreasing.

• increasing x > -1 and decreasing x<-1

• increasing x < -1 and decreasing x > -1

• increasing ꓣ and decreasing nowhere

• increasing -1 < x < 4 and decreasing -3 < x < 1