Can someone plz with questions 3 and 4 and if you can see question 5 then plz answer it . complete sentences. this is for masteries

The grooves or folds of the brain are called

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction

Calculate the ph of a .10m nh4cl solution. the kb value for nh3 is 1.8×10^-5