A jar contains n nickels and d dimes. There are 28 coins in the jar, and the total value of the coins is $2.10. How many nickels and how many dimes are in the jar?

Step-by-step explanation:

So how u do it is

you take 28 and 2.10 and you add it.

you add it with the bigger number at the bottom and the smaller number at the top. You then add it and that’s how many nickels and dimes are in the jar.

Hope this helped. Hehe

hi,

3. 12.15, you are correct.

4.2.01, your first digit is correct,

hope this !