Answer:
Where?
Step-by-step explanation:
Differentiate the given solution:

Substitute
and
into the ODE:

and it's easy to see the left side indeed reduces to 0.
Answer:
3 feet per hours
Step-by-step explanation:
To get unit rate divide foot by hours

A is the correct answer. When put into calculator, the decimals ends.
In fix fraction it will be, 1 7/8
and the exact answer is 15/8
and in decimal from it will be, 1.875