Answer:
7.0 < x < 7.6
X is the ideal pH of the swimming pool
-5/8c = 20....multiply both sides by -8/5 (this cancels out the -5/8 on the left
c = 20(-8/5)
c = -160/5
c = - 32
check..
-5/8(-32) = 20
160/8 = 20
20 = 20 (correct)
so c = -32
Answer:
second 1 is right
Step-by-step explanation:
it is righttttt
Answer:
7.75%
Step-by-step explanation:
7
%
7.75%