For this case we want to find a function of the form
![s = f (d)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/5ulf81agzvnjjnicluakd6nvi0swxi180w.png)
Where:
s: Represents the number of seconds
d: Represents the number of days
So:
By definition we know that 1 hour has 3600 seconds, to know the amount of seconds in a day, we make a rule of three:
1h ------------> 3600s
24h ----------> x
Where "x" represents the number of seconds in a day.
![x = \frac {24 * 3600} {1}\\x = 86400 \ s](https://img.qammunity.org/2020/formulas/mathematics/middle-school/m2zeajg6y3p6nx4tihzye8bjqt4xq3bqif.png)
So, in one day there are 86400 seconds.
Then, the function is as follows:
![f (d) = 86400 * d\\s = f (d) = 86400 * d](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ffy2p3mcu9um3m0645pkyd61py3x5mil7k.png)
Answer:
![s=86400 * d](https://img.qammunity.org/2020/formulas/mathematics/middle-school/ilzj1bbx3jnmab31i0vievnbf0ri6hxp8q.png)