I really need help on this

replace   c   with   a   and simplify.

a = c , b = a, q = n , 2 , a = c , 900 b= a , 700 , q = n , 600 , 2 = b o t h , b = a , q = n

their visual appeal is a sure hook into their content. but big books are also produced for pedagogical reasons, and using them in the classroom makes good teaching sense. an abundance of good children's literature in their lives is vitally important for young children as they strive toward independent reading.