It will reach 80 feet for the second time after 5 seconds.

We set the equation equal to 80 feet:
80= -16t² + 96t

When solving quadratics, we want it equal to 0, so we subtract 80 from both sides:
80-80= -16t² + 96t - 80
0= -16t² + 96t - 80

We use the quadratic formula to solve:
$t=\frac{-96\pm \sqrt{96^2-4(-16)(-80)}}{2(-16)}
\\
\\t=\frac{-96\pm \sqrt{9216-5120}}{-32}
\\
\\t=\frac{-96\pm \sqrt{4096}}{-32}
\\
\\t=\frac{-96\pm 64}{-32}
\\
\\t=\frac{-96+64}{-32} \text{ or } 0=\frac{-96-64}{-32}
\\
\\t=1 \text{ or } t=5$

4 0

3 years ago

I’LL GUVE YOU BRAINLESS... For the water balloon fight, your mom filled up one hundred balloons

alexgriva [62]

Answer:

640 ounces

Step-by-step explanation:

128 fluid ounces per gallon x 5 gallons = 640 ounces

640 /100 = 6.4 ounces per balloon

3 0

3 years ago