Decide whether the rates are equivalent. 17 heartbeats in 15 seconds or 68 heartbeats in 60 seconds. I don't get it.

Well start off by simplifying each rate:

17/15 - - > can't be further simplified

68/60 = 34/30 = 17/15

So then, yes these rates are equivalent.

Also, you can divide 17/15 and 68/60 and compare the quotients.