The term –18xy and which other term are like terms?

a.–18x

b.4yx

c.9y

d.–18

Barbara's piano instructors house is 7 1/8 miles from her house. after biking for 1 3/4 miles she stops to rest how much longer does she need to bike to reach her instructor's house

Which one is true about the hexagons ?

Simplify. 3(4+4x) (type your answer in with no spaces)