Answer:
9 because 27 divided by 3 is 9
When you have two mutually exclusive events, to find the probability of one or another, you add the probabilities.
65+7=72
Final answer: B
Answer:
--- Oven Cleaner
--- Water
--- Blood
--- Vinegar
Step-by-step explanation:
The given molar concentration are:[Missing from the question]
Oven Cleaner: [h+] = 
Water: [h+] = 
Blood: [h+] = 
Vinegar: [h+] = 
Required
Determine the pH
pH is calculated using:

So, we have:
Oven Cleaner:

Using a calculator, we have:

Water:

Using a calculator, we have:


Blood:

Using a calculator, we have:


Vinegar:

Using a calculator, we have:


D 18 and must be a positive number