Answer:

Step-by-step explanation:
hope this helps.
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.
X = 30
hope that helps
180 - 108 = 72
180 - 72 -43 = 65
triangle on the left
Angles = 43,65,72
triangle on the right
180 - 65 = 115
180 - 115 - 35 = 30
so angles of triangle on the right = 30, 35, 115
x = 30 (vertical angles with the other angle of triangle on the right)
Find out how much over the 10 years whatever it says and then use that to explain if it's worth is
You do 10 x 10 6 times and the same for 3 times and your get the answer
example
10^3 x 10^2
10x10x10 = 1,000
10x10 = 100
1,000 x 100 = 100,000