Answer:
all work is shown/pictured
Answer:
Part a
The regression equation is, 
Part b
The number of crimes for a city at 20 police officers was appointed is approximately 10.
Step-by-step explanation:
<u>x y xy x² y²</u>
15 17 255 225 289
17 7 119 289 49
17 13 221 289 169
12 21 252 144 441
25 5 125 625 25
11 19 209 121 361
27 7 189 729 49
22 6 132 484 36
146 95 502 2906 1419
Therefore,


The calculation of the intercept coefficient is as follows:


The regression equation is, 
b)
The calculation is as follows:

≅ 10
The number of crimes for a city at 20 police officers was appointed is approximately 10.
The number of crimes for a city at 20 police officers was appointed is approximately 10.
That is, the number of polices increases then the number of crimes will be decreases.
Answer:
x = 33°
Step-by-step explanation:
x = 180° - 80° - 67° = 33°
We know from Pythagoras' Theorem, a right angle triangle can be identified by the relationship:

Thus, we know if the side lengths of the triangle in question abide by this relation, the triangle is right.
First, we must find the greatest side length.
We know, using the distance formula.



From this, we know that:

Therefore, GB would be the hypotenuse of the triangle.
Now we substitute the values for the two shorter lengths and the greater length into the pythagorean theorem:



Therefore, this triangle is a right angled triangle