Answer:
h = 110.24 m
Step-by-step explanation:
It is given that,
A rock is thrown up from the ground at a velocity of 84 feet per second. The formula
gives the rock's height in feet after t second.
We need to find the maximum height of the rock. For maximum height put 
So,

Put t = 2.62 s in the equation of height. So,

So, the maximum height of the rock is 110.24 m.
Step-by-step explanation:
because it has decimal number.
Answer:
Decay function, 70% per year.
Step-by-step explanation:
A general exponential function is defined as
...(1)
where, a is initial value, |r| is rate of change and x is time in years.
If r>0, then it is a growth function and if r<0, then it is a decay function.
The given function is

It can be rewritten as

...(2)
On comparing (1) and (2), we get

Since r<0, therefore the given function is a decay function.

Therefore, the given function decreasing by 70% per year.
Explanation 9^2 + 12^2= 225 square root of 225 is 15
Answer 15