For this case we have the following situation:
The monthly cost of a gym in the city is $ 3. The initial registration is $ 25. Write a mathematical expression that models the problem.
So we have to define variables:
x: number of months
y: total cost
The mathematical expression that models the problem is:
C. It is fifth degree because the highest power in it is 5. It is a binomial because there are two terms in it.
A is also 5th degree, but it has three terms. D is a binomial, but its degree is 3.
B is neither a binomial nor fifth degree.