Help on this question lots of points and brainlest no wrong answers and explain please ! (The question is at the top )

What is the square root of 45? (step by step working plz)

The random variable x represents the number of phone calls an author receives in a day, and it has a poisson distribution with a mean of 8.7 calls. what are the possible values of x

What expression is equivalent to log3(x+4)