F=21 (A)
I hope this was helpful
The value of
is 
Explanation:
Given that the functions
and 
We need to determine the value of 
The value of
can be determined by substituting the value of
and
and simplifying the terms.
Thus, let us assign
in the function
, we have,

Now, let us assign
in the function
, we get,

Grouping the like terms, we have,

Adding the like terms, we get,

Hence, the value of
is 
Answer:
Step-by-step explanation:
45 minutes running and 15 minutes walking, to get a total of 1 hour.
Step-by-step explanation:
when you add integers remember that the positive integers move you to the right (so the integer will increase) and negative integers move you to the left (so the integer will decrease)
Hope this helps.