PLEASE SHOW ALL EQUATIONS AND WORK DONE TO FIND THE ANSWER. I do not understand how to solve it$.$

Find the orbital parameters of the ISS and write them as the 'Given' for this problem using proper SI units!

a$.(3$ pt$)$ what is the mean radius of the ISS orbit?

b$.(3pt)$ what is the angular velocity of the ISS?

c$.(3$ pt$)$ what is the centripetal acceleration of the ISS?

d$.($bonus $2pt)$ Why is that astronauts onboard the ISS don't feel this acceleration but when a car takes a curve, all passengers do feel it$?$