You push your little sister on a swing and in 1.4 minutes you make 42 pushes. What is the frequency of your swing? Answer in units of Hz.

Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

Math it's appreciated. (picture provided)

Ireally need subtract and simplify.(-y^2 – 4y - 8) – (-4y^2 – 6y + 3)show your work, ! i will mark you brainliest but you have to show your work.