Answer:
7.0 < x < 7.6
X is the ideal pH of the swimming pool
Answer:
C. x2+x-2
Step-by-step explanation:
Answer:
D. x = 22.5
Step-by-step explanation:
Answer:
There is an error in the question.
All angles in an equilateral triange are 60º
Since the area of a circle is π

, and our radius is 9 we know the total area to be 254.469, and the ratio of sector area to total area is 169.56/254.469 = .6663. There are 360 degrees in a circle, so:

≈ 240°
240 degrees