#3 it will take him 40 mins because 8×5=40
Step-by-step explanation:
Given:
Taking the 1st and 2nd derivatives of the above expression,
Therefore,
This shows that is the solution to the differential equation
By the chain rule,
so
You were able to find
, which requires knowing both
and
. Do you also happen to know
and
?
It would be: k+3 = 10
subtracting 3 from both sides,
k+3-3 = 10-3
k=7
The answer to the question is 4.5