Answer:
Step-by-step explanation:
Use the slope formula:

where m = slope
(-5, 0) -> means x1 = -5. y1 = 0
(7, 8) -> means x2 = 7 , y2 = 8
Substitute these values into the slope formula above and you get:

7 is the radius of the circle
Answer:
i believed its a=-3
Step-by-step explanation:
-2(a-3)=12
-2a+6=12
-2a=6
divide -2
a=-3
The answer is 
This is the expression 57-8*sqrt(6) all over 15.
The steps on how to get this answer are shown below in the attached image.
Answer:
D
Step-by-step explanation:
X is increased by a factor of 5, so y should be multiplied by 5 as well. So y = 20*5=100