Question

Find the value of x for the triangle or rectangle... plz help asap 4 both

Answer 1

9.) Perimeter=23
23=x+x+3+2x
23=4x+3
23-3=4x
20=4x
20/4=x
x=5
10.) Perimeter=24
24=x+3+2x+x+3+2x
24=6+6x
24-6=6x
18=6x
18/6=x
x=3