Na quinta da Marta existem galinhas e porcos. Sabendo que existem 10 cabeças e trinta patas, quantos sao as galinhas e quantos sao os porcos?

Which expression is equivalent to 4 square root 6 divided by 3 root 2

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?