We find the average by adding up all the students and dividing them by the number of classes she has. 19 + 13 + 19 + 9 + 14 + 15 is 89, and that divided by 6 is approximately 14.8, rounded to the nearest tenth.
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Hope this helps!
Answer:

Step-by-step explanation:
The given triangle is a 45°-45°-90° triangle. Use the following rule:

The length of the legs is 4. Insert this value into the equation:

Simplify:

:Done
I'd have to say it's A. Please don't blame me if I'm wrong. :)
Answer:
That's math for you.
Step-by-step explanation: