3y+21+8y
11y+21 is the answer
First answer is 135 and Second answer is 900
Given:

To find:
The length of QR.
Solution:
We have,

Then,
(CPCTC)



Divide both sides by 4.


Similarity,
(CPCTC)



Divide both sides by 2.

Now,


Therefore, the correct option is d.
Answer: 1/6
Step-by-step explanation:
The temperature went down by 12 degrees. (Or you could say it changed by -12 degrees)