CCSS.Math.Content.HSA.REI.B.4

A diver is standing on a platform above the pool. He jumps form the platform with an initi8al upward velocity of 8 ft/s. Use the formula h t = −16 t² + 8t + 24, where h is his height above the water, t is the time, v is his starting upward velocity, and s is his starting height. How high is the platform?

• .25 ft
• 24 ft
• 25 ft
• 8 ft

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CCSS.Math.Content.HSA.REI.B.4

Solve by factoring.
3a² - 12a + 12 = 0

• -2
• 2
• 2/3
• 5

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CCSS.Math.Content.HSA.REI.B.4

What are the x- intercepts?

• x= 0 and x= -4
• x= 0 and x= 4
• y= 0
• x= 2

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CCSS.Math.Content.HSA.REI.B.4

A ball is thrown into the air with an upward velocity of 100 ft/s. Its height, h, after t seconds is given by the function
 h = -16t² + 64t + 960.
When did the ball hit the ground?

• 10 seconds
• 2 seconds
• 5 seconds
• 7 seconds

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CCSS.Math.Content.HSA.REI.B.4

Solve on the domain [0, 2π)
4sin²x = 3

• π/6, 11π/6
• π/3, 2π/3
• π/6, 5π/6, 7π/6, 11π/6
• π/3, 2π/3, 4π/3, 5π/3

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CCSS.Math.Content.HSA.REI.B.4

Solve by taking square roots:
5m² + 1 = 6

• m = 0
• m = 1 or -1
• m = √7
• m = 7/5 m = -7/5

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CCSS.Math.Content.HSA.REI.B.4

QUESTION 5

• A
• B 
• C 
• D 

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CCSS.Math.Content.HSA.REI.B.4

How many roots does this parabola have? 

• 3
• 2
• 0
• 1

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CCSS.Math.Content.HSA.REI.B.4

Solve for 0≤x≤2π

3sin²x + sinx - 4 = 0

• 0, π

• π/2

• π/6, 5π/6

• 3π/2

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CCSS.Math.Content.HSA.REI.B.4

What are the zeros of f(x) = m²-9m+20?

• 4, 5

• -4, -5

• 2, 10

• -2, -10

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CCSS.Math.Content.HSA.REI.B.4