For this we almost have the following equation:

We must match the equation to zero:

From here, we clear the value of t.
We have then:

We discard the negative root because we are looking for time:
Answer:
it will take him to reach the ground about:

seconds
Answer:41a
Step-by-step explanation: when you multiply a number and a variable it will give you the number and the variable which is the unknown
The correct answer is B. Hypothesis
4x80=320
Work:
4x8 = 32
(4+4+4+4+4+4+4+4)
Now carry the 0 and you get 320