Is the relation a function ? Yeah

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

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

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle