Find the length of the missing side

21.6 in

Step-by-step explanation:

since it's a right triangle, use the pythagorean theorem (a^2 + b^2 = c^2)

12^2 + 18^2 = c^2

144 + 324 = c^2

468 = c^2

c = square root of 468

c = 21.6333 (...) in

since you have to round it up to the nearest tenth, then the answer should be 21.6 in

36%

Step-by-step explanation:

Lets say the number is 20. Then we can use the percentage 20%. 16.

Then you would do it again. $12.80

If you use 40% it would be $12.00

Therefore it would be slightly smaller which would be a percentage of 36%

Henceforth two 20% is the same as one 36%