400. Just add a zero when you're dealing with tens
87 24/25.......24/25 = 0.96......answer is 87.96
224 7/10....7/10 = 0.7....answer is 224.7
686 49/50...49/50 = 0.98...answer is 686.98
90 = k*15
constant of proportionality = 80 / 15 = 6 Answer
The area is 19.5 and the perimeter is 23.1
The total of all angles are 360 degrees for a parallelogram. One angle is 10 and the one opposite is also 10. B = 340/2=170 degrees