QF & X-Intercepts (WPs)

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

How high would you jump if the equation for jumping from a cliff is:

h(t) = -16t² + 8t + 24?

• 25

• 24

• 8

• 26

At what time would you reach 16 ft above the water if you jump of a cliff using the formula:

h = -16t² + 8t + 24?

• 8

• 1

• 1/2

• 1/4

Find the vertex of

f(x) = -x² - 4x + 12.

• (-2, 16)

• (-2, 14)

• (2, 4)

• (-2, 4)

Solve each equation with the quadratic formula.

• x = -0.4, 0.4

• No Solution

• x =-2.3, 1.2

• x = -0.2, 0.2

Tags

CCSS.HSA-REI.B.4B

Determine the vertex for y = 5x² - 20x + 13

• (5, -7)

• (-2, -7)

• (2, -7)

• (-7, -2)

A lizard is jumping across the water in search of food. The equation h = -12t² + 6t models the lizard's height in feet above the water t seconds after he jumps. How long after jumping is he back on the water?

• 0.1 seconds

• 0.25 seconds

• 0.50 seconds

• 0.75 seconds

• 1 second

Your cousin hit a golf ball with an initial velocity of 27 feet per second. The equation h = -6t² + 27t models the golf ball's height in feet t seconds after the ball was hit. How long after being hit did the ball reach maximum height?

• 1 second

• 2.25 seconds

• 3 seconds

• 4.5 seconds

• 5 seconds

Find the x-intercepts of the equation f(x)= x² + 2x - 24

• x = 4,-6

• x = 0, -24

• x = 6, -4

• x = 5, 0

Tags

CCSS.HSA-SSE.B.3B

CCSS.HSF-IF.C.8A

Find the x-intercepts of the equation

f(x)= -x² + 4x + 5

• x = -1, 5

• x = 1, -5

• x = 0, 5

• x = 4, 5

Tags

CCSS.HSA-SSE.B.3B

CCSS.HSF-IF.C.8A