Answer:

Step-by-step explanation:
Given Equation:

Actually the given equation is the 2nd equation of motion
i.e. 
where
because the astronaut jumps on the earth
and initial velocity 
to find time
, put the given value of
in the given equation, we get

it will take
to reach the ground if he jumps on the Earth
Answer:
Step-by-step explanation:
d and r are the diameter and radius, respectively.
d = 8 units
r = 8/2 = 4 units
area = πr² = 16π square units.
There are 16 cups in a gallon. 6 pints in a quart. 4 quarts in a gallon.
The answer would be 9 because
another way to name 1/4 is a quarter because 1/4 of 100 is 25 %, so that's why it is called a quarter.
hopefully this helps you :)