Find the slope of the line (-1,9) (9,9)

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

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

If you could answer these your a life saver