Question

The amount of money in Toni's savings account after x weeks is described by the function

f(x) = 5x + 20.

Which best interprets this function?


options:


Toni's savings account started with $5 and increased by $20 each week.


Toni's savings account started with $20 and increased by $5 each week.


Toni's savings account started with $20 and decreased by $5 each week.


Toni's savings account started with $5 and decreased by $20 each week

Answer 1

The correct answer would be B, or the second option.

In a function like this, the y-intercept, or the term without a variable, can be always be interpreted as a sort of starting amount, or a base amount.

Because we're given 5x + 20, we know 20 will be the base, or starting value, while 5 is the amount being added per value of x, which is equal to weeks.

Thus, the correct answer is B.