Answer= D
1package 7 packages
____________=____________
75 envelopes x envelopes
1x=525
divide both sides by 1
x=525 envelopes
Yes, for every value of x, there is only one value of y. This means that y is a function of x.
If 11/11 were to be equal to 1, then 22/11 will be equal to 2.
Less then i really hope i helped