Answer: 3. 4
4.
Step-by-step explanation:
8^2 + 12^3 = c^2
64 + 144 = c^2
208 = c^2
√208

The final answer is the square root of 208
8^2 + b^2 = 17^2
64 + b^2 = 289
-64 64
b^2 = 225

When you divide by a negative make sure you switch the sign to the opposite side
Pattern #1: (I think it should have started with 7, not 17)
7 -> 14 either added 7 or multiplied by 2
14 -> 8 subracted 6
8 -> 16 either added 8 or multplied by 2
16 -> 10 subtracted 6
10 -> 20 added 10 or multiplied by 2.
The pattern seems to be multiply by 2, then subtract 6, repeat.
14 -> 28
28 -> 22
Pattern #2:
11 -> 13 added 2
13 -> 16 added 3
16 -> 20 added 4
20 -> 25 added 5
25 -> 31 added 6
31 -> 38 added 7
to finish...
38 + 8 = 46
46 + 9 = 55