Will award brainliest.
what is the domain of the function f(x)=x-5/x^2-9 (treat / as a fraction bar .)

1. all real number except 9
2. all real numbers except 3 and -3
3. all positive real numbers
4. all real numbers except 5 and 9

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Over which interval is the graph of f(x) = x2 + 5x + 6 increasing?

Max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.