Please help, thank uuu! No links please even though ik you guys won’t listen. DUE SOONNN

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

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2