Well, product means multiply so we need to multiply these fractions.
2 4
--- x --- =
3 5
now, when you are multipliying fractions you multiply the top and the bottom with the other one.
so 2 times 4 and 3 times 5
and you get
8
--
15
since this fraction can not be simplifyed this is the final answer 8/15
by dy/dx, we'll be assuming that "y" is encapsulating a function, a function in terms of "x".

Can you try to put them I order?
Answer:
The interest rate is 7.5%
Step-by-step explanation:
You get the difference from the new number and the original. In this case, it is 30.96. I then divided the original by 30.96. The answer turned out to be .15. I doubled checked my answer by timing the original by .15 and adding it. But, I had to divide .15 by 2 so I could get the amount per year. So, it would be 7.5% per year of interest.