Serena is a coffe shop manager. the amount of mobey she earns is represented by the equation "m=21h", where "h" is the number of hours serena works, while "m" is the amount of mobey she earns. how much more money does serena make an hour than gabe? , who earns $13.50/hr.

Serena would make $7.50 more per hour than Gabe.

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.