Can anyone help me with this? (I also need a reasoning)

I’m still confused on how to work the percentages

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Ameteorologist is studying the monthly rainfall in a section of the brazilian rainforest. she recorded the monthly rainfall, in inches, for last year. they were: 10.4, 10.3, 11.7, 11.1, 8.0, 4.4, 2.6, 1.8, 2.5, 4.4, 7.3, 9.5 fill in the missing values in the formula. what is the variance?