1) x=1
2) x=2.9
3) x=-10
4) x=?
5) IDK
A because radius is half of the diameter
Given the dataset

We start by computing the average:

We compute the difference bewteen each element and the average:

We square those differences:

And take the average of those squared differences: we sum them

And we divide by the number of elements:

Finally, we take the square root of this quantity and we have the standard deviation:

Answer:

Step-by-step explanation:
This is Isosceles triangle (look at the picture).
We know:
All triangles have internal angles that add up to 180°
Therefore:

combine like terms:

(x - 2)° and 3y° are supplementary angle (Two Angles are Supplementary when they add up to 180°).
Therefore:

substitute x = 29 and solve for y:

Answer:
She has 9 trees. 3+2+4=9. (3+2)=5+4=9