Work out the area of trapezium ABDE

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Aswim teacher sells lesson packages. the best deal has the highest ratio of lessons to total cost.swim lesson packagesnumber of lessons total cost$10$4010 1 $8015$80which package is the best deal? l lesson for $105 lessons for $4010 lessons for $8015 lessons for $80mark this and returnsave and exit

Find the quotient. 50a2 – 98b2 -5a +7b