Answer:
4.3
Explanation:
Let's go through each answer choice. Whatever number we get, when we multiply that number by itself, it should be pretty close to 19.
1:
- 4.6 x 4.6 = 21.16
- 21.16 is pretty close to 19, but let's see if we can do better.
2:
- 3.8 x 3.8 = 14.44
- 14.44 is a bit far from 19, so we can take out this option.
3:
- 5.4 x 5.4 = 29.16
- 29.16 is really far away from 19, so we can cross this option out.
4:
- 4.3 x 4.3 = 18.49
- 18.49 is extremely close to 19 among all these answers, so 4.3 is the correct answer.