12.0 is the answer I think
The equation of a circle:

(h,k) - the coordinates of the centre
r - the radius
Answer:
36
Step-by-step explanation:
8x-20=5x+1
-5 -5
3x=-20+1
+20 +20
3x=21
3 3
x=7
8(7)-20
FED=36
Answer:

Step-by-step explanation:
(3x²+6x-5)(-3x)
Apply distributive law.
-3x(3x²)-3x(6x)-3x(-5)
Simplify.
-9x³ - 18x² + 15x
Answer:
64in
Step-by-step explanation:
links=8*3=24
compartments + engine=4*8+8=40
40+24=64