There are 5280 feet in a mile, if thats what youre asking..?
idk if this was helpful or not, sorry :/
7 because the 3 is the coefficient and the x is the variable. The + is the operator so that leaves you the 7
It is proportional because it has a direct relationship.
3 x
---------= --------- ---------
15 180
15x=540
----- ------= 36 students.
15 15
Steps: Cross multiply to get 15x and 540. Divide both numbers by 15, then you found what x equals, which is the answer.