Answer:
9
Step-by-step explanation:
Sorry if it is incorrect but here is why I think it is 9 so 13 + 13 is 26 if the perimeter is 44 subtract 44 by 26 you get 18 divide that by 2 and you get 9 have a nice day sorry again if its wrong I suck at math
1) x=10
2) x=6
3) x=13
1) 15x-17+4x+7=180
19x-10=180
19x=190
x=10
2) 13x+5=16x-13
5+13=16x-13x
18=3x
x=6
3) 9x+7=11x-19
7+19=11x-9x
26=2x
x=13
