What the sum of 13 and 14 (do not answer the question)

Atotal of 980 students were asked what their favorite holiday was and 525 students said christmas what percent of students said christmas was their favorite holiday

The torque output of an engine is usually measured in the units of a rpm b bhp c foot pounds d feet per pound

This is an ap world history question. i am working on a worksheet which has a vent diagram with each circle labeled either us or byzantine economy. the middle is the similarities. can someone explain to me the similarities and especially the differences between the two?