Use Pythagoras's theorem.

Now, minus 12 from 15:
15 - 12 = 3,
which you need to square.
So the length of a = 9cm.
You can also do:

Which gets 9.
Hope this helps.
I wasn't sure if you wanted the percentage, or the amount, so I'll give both.
Amount discount is 8.25.
Percentage discount is 84.999%.
Answer:
choice C
Step-by-step explanation:
First, you need to know that this is the Fibonacci Sequence, a series of numbers: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ... where the next number is found by adding up the two numbers before it.
So, if we want to find the next 3 terms...
5+8=13
8+13=21
13+21=34.
So, your answer is choice C
1/2 of a mile is divided equally into 3 parts- we need to find the distance between the second and third sign.
1/2 x 1/3 is 1/6.
This means that each sign is 1/6th of a mile apart.
If you have further confusions about the question, please feel free to message me and I will help to the best of my ability!
Hope this Helps!
-Sinnamin