Equation of an line that is perpendicular to y-3=-4(x+2) and passes through the points (-5/7)

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

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