They always said algebra was another language. Write it just as you read it.
"half of the 7th graders" = 1/2 x s "one third of the 8th graders" = 1/3 x e "divided into 10 teams" = put everything over the denominator of 10 final answer= [tex] \frac{ \frac{s}{2} + \frac{e}{3} }{10} [/tex]
