Answer:
Angle A is F Angle A = 57. 52+71=123. 180-123=57
To find the mean, you have to add all the numbers then divide it by how many numbers there are.
In this case, you'll need to add all those numbers and divide it by 4.

The mean is 1995.
Answer:
d=222
Step-by-step explanation:
The answer is 8
I hope this helps!
Glass and Titanium. Glass is because (10,40) (y over x) is 4 and Titanium is because (10,60) is 6 cork and lead are not since when dividing y over x it doesn't equal 2.