How much do you need to subtract from 67/10 to make 6

Can someone check my answer? you : )

Apackage of bacon holds 15 strips of bacon. the pancake house uses 17 packages of bacon in the morning and 21 packages in the afternoon. how many more strips were used in the afternoon than the morning?

Which statement accurately describes how to perform a 90° clockwise rotation of point a (1,4) around the origin?