P=2w+2l
We know that P=90 and l=15 so we can plug in and solve for w:
90=2w+2(15)
90=2w+30
60=2w
30=w
The width is 30.
(you could draw a diagram by labelling the two shorter sides 15 and the other sides w)
Hope this helps!!
You have 180 degrees in a triangle so 180-40-51=89
L= 6+w
6+2w=36
-6 -6
2w=30
w=15; l= 21
15x21= 315
A=315
The answer would be 9/-33. The formula for slope is M= y-y1/x-x1. 6-(-3) is 9, so that your numerator. -1-31 is -33 so that's your denominator.