2.1 Quiz

Find the y-intercept of the function y = -3(x+2)² - 5

• (0,-5)

• (2,-5)

• (-2,-5)

• (0,-17)

What is the initial (starting) height of an object following this path: h(t) = -16t² + 20t + 6

• 20 feet

• 6 feet

• 0 feet

• -16 feet

When I want to find the maximum and minimum of an object, I should _______________.

• Set the equation = 0 and solve.

• Substitute x = 0 in the equation.

• Find the y coordinate of the vertex.

• Use x = (-b/2a) as my answer.

A raft is dropped from a helicopter 256 feet in the air, above the ocean. Its approximate height, h, after t seconds is given by the function: h(t) = -16t² + 256. How many seconds did it take for the raft to hit the water.

• -4

• 4

• 2

• 8

If a path of projectile is modeled by: h(t) = -16t² +20t + 6, what is the height after 1 second?

• 20 feet

• 10 feet

• 6 feet

• 4 feet

What is the increasing interval from the function shown:

• $\left[1,\infty\right]$

• $\left(-\infty,2\right]$

• $\left(-\infty,1\right]$

• $\left[2,\infty\right]$

A juggler is tossing a ball into the air. The height of the ball in feet can be modelled by the equation: y = -16x² + 16x + 5, where y represents the height of the ball at x seconds. What is the maximum height of the ball?

• 5 feet

• 9 feet

• 0 feet

• .5 feet

Find the vertex of the quadratic: y = -2x² + 4x + 3

• (-1,5)

• (1,-5)

• (0,3)

• (1,5)

What is the decreasing interval on the function shown:.

• $\left[2,\infty\right)$

• $\left(-\infty,1\right]$

• $\left(-\infty,2\right]$

• $\left[1,\infty\right]$

Which function has a minimum?

• $y\ =\ -2\left(x-2\right)^2+4$
  

• $f\left(x\right)\ =\ -\frac{1}{2}\left(x-4\right)\left(x-5\right)$

• $f\left(x\right)\ =\ -2x^2\ +\ 3x\ -\ 4$

• $f\left(x\right)\ =\ 2x^2\ +\ 3x\ -\ 7$