Answer: ![\{x|x \exists \mathbb{R}, x > 3 \}](https://tex.z-dn.net/?f=%5C%7Bx%7Cx%20%5Cexists%20%5Cmathbb%7BR%7D%2C%20x%20%3E%203%20%5C%7D)
Step-by-step explanation:
Adding 5 to both sides, we get <u>x > 3.</u>
Answer:
4
Step-by-step explanation:
pythagoras theorem = a* + b* = c* ( by '*' i mean squared)
2* + b* = square root twenty
4 + b* = 20
b* = 16
b = 4
Answer:
1/24
Step-by-step explanation:
This is a mutually exclusive event.
There are four possible floors and four people.
The probability that the first floor is selected is 1/4
The same probability exists for the second floor and the third and the fourth.
So, the probability of all four people choosing different floors is 1/4 * 1/4 * 1/4 * 1/4 = 1/24