Answer:
the height above the seal level at the end of the hike is 
Step-by-step explanation:
The computation is shown below:

Hence, the height above the seal level at the end of the hike is 
Certain means the event will happen.
Impossible means the event would never happen.
4000 ........................................
Since .68 is 68/100, you can simplify to 17/25.
Answer:
49.12 ft^2
Step-by-step explanation:
The triangle:
Area = 1/2 * base * height
= 1/2 * 6 * 8
= 24
The semicircle:
Area = 1/2 * 3.14 * 4^2
= 25 .12
Total area = 24 + 25.12
= 49.12 fT^2