Form three equivalent fractions for 3/4 by multiplying 5/5,7/7 and 3/3 (I don't understand)​

Multiply 3/4x5/5 and 3/4x7/7 and 3/4x3/3 and you get 15/20, 21/28, and 9/12.if you simply them they all equal 3/4. Make sense?

This is what i found “an explicit formula designates the nth term of the sequence, as an expression of n (where n = the term's location). it defines the sequence as a formula in terms of n. this example is an arithmetic sequence(the same number, 5, is added to each term to get to the next term).” i hope this you for what your looking for. can you plz mark me brainliest?