Greatest common factor. can someone explain

Reinel saves 30% of every pay check. his paycheck last week was 560$. how much did reniel save last week?

A10 inch cookie cake is divided into 8 slices. what is the area of 3 slices

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?