Key Features Quadratic

What is the y-intercept of the graph?

• (0, -4)

• (0, 4)

• (0, 8)

• 6, 0)

Which coordinates best represent the vertex of the graph?

• (0, -5)

• (-2, -5)

• (0.5, 0)

• (-4.5, 0)

Graph it and use menu 5 1 to answer the question.

• A

• B

• C

• D

Graph it and use menu 5 1 to answer the question.

• A

• B

• C

• D

Which equation best represents the axis of symmetry?

• x = 3

• y = 0

• x = 6

• y = -9

An object in launched directly upward at 64 feet per second (ft/s) from a platform 80 feet high. Its height is represented by the equation

s(t) = –16t² + 64t + 80

What will be the object's maximum height?

• 2 ft

• 80 ft

• 144 ft

• 64 ft

What is the axis of symmetry of y=2x²-4x+9?

• x = 1

• x = -1

• x = -2

• x = 4

A ball is thrown into the air with an upward velocity of 40ft/s. Its height h in feet after t seconds is given by the function :

h(t) = -16t² + 40t + 10

How many seconds does it take the ball to reach its maximum height?

• 1.25 seconds

• 1.4 seconds

• 2.5 seconds

• 2 seconds

What was the maximum height of the water? Choose the key feature and the answer.

• y-intercept, 0 feet

• x-value of the vertex, 2 feet

• y-value of the vertex 10 feet

• x-intercept. 3.85 feet

What is the vertex?

• (-3, 0)

• (3, 0)

• (0, 18)

• (18, 0)