For questions 2 and 3, use a calculator to find the values of the inverse function in radians. image below with options. me out

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

Through non-collinear points there is exactly one plane.

The high temp today was 62°. when nighttime comes, the temp will drop 40°. by 4am the temp will drop an additional 40°. what is the temp at 4am?