Question

Twelve books cost $59.88 and 21 books cost $104.79. Is there is a constant of proportionality between these purchases?

Select the correct answer.



Yes, each book costs $2.85.



Yes, each book costs $4.99.



No, some books cost $2.85 and others $8.73.



No, there is no constant of proportionality.

Answer 1

Answer:

Yes, each book costs $4.99.

Step-by-step explanation:

59.88 divided by 12= 4.99

104.79 divided by 21 = 4.99

Answer 2

Answer:

Yes, each book costs $4.99.

Step-by-step explanation:

We can look for our $Rate$

$59.88\div12=4.99$

To check if the the $rate$ is constant we multiply $4.99$ by $21$

$4.99\cdot21= 104.79$

Which means our rate is constant

Brainliest please :)