Answer:
7.0 < x < 7.6
X is the ideal pH of the swimming pool
13
Step-by-step explanation:
3 x 3 = 9
7 + 3 = 10
7 + ? = 3 + 7 + 3 + 7
7 + ? = 20
? = 13
one side length has to be equal in both triangles.