D = drinks, p = popcorn
17 + 3.50d + 3.00p
variables : a letter in place of an unknown number : (d and p)
coefficients : the number multiplied by the letter : (3.50 and 3.00)
constants : a lone number, no variables attached : (17)
50-6x=y
since each car wash is 6 dollars and you do not know the number of cars washed it is 6x
50-6x is because you need to find out how much is left in the card so you subtract the total from how much she spent
Fallow the steps in the picture
5x+26< 6 maybe this is the answer
N - 3n and 6 - 4n
If these aren't right, I'm sorry.