172% of what number is 48 provide an exact fraction answer

i got the decimal answer but cant get the fraction one

For f(x)=2x+1 and g(x)= x^2 -7, find (f•g)(x)

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?