Answer:
8
Step-by-step explanation:
55 -7 = 48
48/6= 8
Check answer:
8x6= 48
48+7= 55
-1 - (-7) = 6
5 - (-1) = 6
11 - 5 = 6
The common difference is 6.
If you add 6 to a term, you get the next term.

Answer:
y=1
Step-by-step explanation:
6=2y+4
2=2y
y=1
Answer:
x=6, y=75
Step-by-step explanation:
Since the diameter of the circle is a perpendicular bisector to the chord, x and 6 must be equal and therefore x=6. It also bisects the arc, meaning that y=75. Hope this helps!