Answer:
![{ \tt{pH = - log[H {}^{ + } ]}} \\ pH = - log(4.2 \times {10}^{ - 5} ) \\ pH = 4.38](https://tex.z-dn.net/?f=%7B%20%5Ctt%7BpH%20%3D%20%20-%20%20log%5BH%20%7B%7D%5E%7B%20%2B%20%7D%20%5D%7D%7D%20%5C%5C%20%20pH%20%3D%20%20-%20%20log%284.2%20%5Ctimes%20%20%7B10%7D%5E%7B%20-%205%7D%20%29%20%20%5C%5C%20pH%20%3D%204.38)
Step-by-step explanation:
H
3.9 x 10 ^-5 is the answer. 0.000039 in scientific notation is 3.9 x 10^-5
Answer:
1. 5xy^3
2. 4/9m^6 n^4
3. 2a^2/c
4. 4x^3m+6/3
Step-by-step explanation:
The given sum for n = 1 to n = 15 is equal to 255, so the correct option is B.
<h3>
How to find the sum of the given series?</h3>
We want to find the sum of the series whose elements are of the form:
(2n + 1)
From n = 1 to n = 15.
Then our sum will be:
(2*1 + 1) + (2*2 + 1) + ... + (2*15 + 1).
3 + 5 + ... + 31
This is the sum of all odd numbers in the interval [3, 31]
Which gives:

So the correct option is B.
If you want to learn more about sums:
brainly.com/question/24295771
#SPJ1
Answer:
Yes Sam's correct
Step-by-step explanation:
The rectangle is 2x longer the square and you can tell by the length. (if you need anymore help just ask me)