Is a triangle with side lengths 6, 10, 12 a right triangle?

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15