Answer:
B) the initial amount of the account
Step-by-step explanation:
When x=0, no days have passed, so the y-intercept is there to see how much money you started with in the account.
Answer:
Sooo it can complete 120 laps in 1 hour.
In this equation, there is nothing to solve for. However, the expression

is the Pythagorean theorem. If there is a right triangle, then when the lengths of two shorter legs (a and b) are added together, and then square rooted, you get c, which is the hypotenuse.
Hope this helps!
You get a "sum" when you add numbers together.