A line segment is defined as the set of numbers that is contained in a line between the two endpoints.
We can write and solve the differential equation that fits the statement given;
dy/dt = k(50-t)
∫dy = ∫ k(50-t)dt
= ∫ (50k - kt) dt
therefore;
y = 50kt - k/2(t²) + C
Alternatively, can be written as
y = - k/2 (50-t)² + C)
80 inches squared, I would assume based off of the other one.
Answer:
He will earn $6 in interest in 9 months.
Step-by-step explanation:
This is a simple interest problem.
The simple interest formula is given by:

In which E is the amount of interest earned, P is the principal(the initial amount of money), I is the interest rate(yearly, as a decimal) and t is the time.
After t years, the total amount of money is:

Initial deposit of $400.
This means that 
2% annual interest
This means that 
How much interest will he earn in 9 months?
An year has 12 months, this means that 
This is E. So

He will earn $6 in interest in 9 months.