8r and 4r are like terms since they both have an r
also 3s and -3s are also like terms because of the s
C. I used the app math way. it has been a lifesaver.
I believe by the first equation they are referring two a representation of the total amount of money made up by the two types of coins. I found this to be 0.05x + 0.10y = 3.50
In my work I solved for the amount of each coin- I assume this is what the final step of your problem entails. If you need any help understanding/ I misinterpreted something please feel free to comment and ask :)
#5c coins or x= 36
#10c coins or y= 17
For question for for question 1 you want to divide 22 by 55