A bird drops a stick to the ground from a height of 80 feet. The equation 0=−16x^2+64x+80 gives the number of seconds that have passed when it hits the ground. After about how many seconds did the stick hit the ground? I need an answer pretty quickly, and I can't figure out the answer. The answer should look like this, x= so and so

Thanks

x = -1 and 5

Step-by-step explanation:

Solve:  

Factor out common value of 16:

Divide both sides by 16:  

Change signs:

Break expression into groups:

Factor parentheses:

Factor out common term :

Therefore,

 and  

So and

b. astronomers

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.