10. 10
11. -2.8
Hope u enjoyed xD
For determining the period of a function, you pick two recognizable tops of the graph and calculate the time difference between them. In this situation the period is 5-1=4, by picking the first two tops
Reflecting across the x axis maintains the same x coordinate, but changes the sign of the y coordinate.
So, the transformation is

Answer:
-20
Step-by-step explanation:
(y - 6) / (-3-4) = -2
(y-6)/7=-2
y-6=-2*7
y=-14-6 =-20