Answer: ummm i think it's -1
Step-by-step explanation:
The answer to your question is 54
By solving a quadratic equation, we will see that the ball hits the ground after 2.6 seconds.
<h3>How long does it take for the ball to hit the ground?</h3>
Here we need to solve the equation:
h(t) = 0 = -16t² + 40t + 4
This represents that the ball hits the ground.
So we just need to solve that quadratic equation, using the general formula we get:
![t = \frac{-40 \pm \sqrt{(40)^2 - 4*4*(-16)} }{2*-16} \\\\t = \frac{-40 \pm 43.1 }{-32}](https://tex.z-dn.net/?f=t%20%3D%20%5Cfrac%7B-40%20%5Cpm%20%5Csqrt%7B%2840%29%5E2%20-%204%2A4%2A%28-16%29%7D%20%7D%7B2%2A-16%7D%20%5C%5C%5C%5Ct%20%3D%20%5Cfrac%7B-40%20%5Cpm%2043.1%20%7D%7B-32%7D)
We only care for the positive solution, which is:
t = (-40 - 43.1)/-32 = 2.6s
So the ball hits the ground after 2.6 seconds.
If you want to learn more about quadratic equations:
brainly.com/question/1214333
#SPJ1
18 = 2·3·3
So possibles prisms are:
2×3×3
1×2×9
1×6×3
1×1×18
Therefore Quentin can make 4 different rectangular prism with 18 unit cubes.