Answer: 
Step-by-step explanation:
Rewrite it in the form
, where 

Use Square of Sum: 

x=18 if im not mistaken that was pretty easY
That would be 225% and 2.25 I really hope this helps!!
Answer for the second question:
5*2 is 10
10 *2 is 20
20*2 is 40
40*2 is 80
80 *2 is 160
That's five hours
160*2 is 320
320*2 is 640
640*2 is 1280
1280*2 is 2560
The answer should be 2560
I forgot how to do it with the equation sorry
It's too blurry you might want to retake the picture