Answer:
The answer is option 3.
Step-by-step explanation:
You have to substitute H+=2×10^(-9) into the equation of pH :
pH = -log[H+]
H+ = 2×10^(-9)
pH = -log[2×10^-9]
= 8.70 (3s.f)
put in an positive number for x and check
2 - 5 = -3
5 - 2 = 3
- 2 + 5 = 3
5 + (-2) = 2
so the only different one is the first
Answer:
The height of the pyramid is 
Step-by-step explanation:
we know that
The volume of a square pyramid is equal to

we have


substitute and solve for h



Answer: 8^6
Step-by-step explanation:
=
subtract the bottom exponent from the top exponent.