Find the angle between the vectors u and v. Express your answer in degrees and round to the nearest tenth of a degree.
u = {5,-5,-9), v=(-8,1,-2)

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.