I need help with bearings even though I’m told “Bearings are easy” I tried but I gave up so I checked the answers it said 161 for a) but I don’t know how to get it

(c) a vine called the mile-a-minute weed is known for growing at a very fast rate. it can grow up to 0.5 ft per day. how fast in inches per hour can the mile-a-minute weed grow up to? show your work using the correct conversion factors.