Answer:
A. 17
Step-by-step explanation:
The "mean" is the same as an average.
To find the mean, add all the numbers.
Then divide that sum by the total numbers you added.
18+23+9+16+30+16+7=119.
119/7= 17. (We divided by 7 because we added 7 numbers)
Hope this helps!
9
a^2 + b^2 = h^2
15^2= 12^2 + b^2
225=144+b^2
81=b^2
