book Maths Puzzle Numerical Ability

Find the area of a parallelogram ABCD, given that AB = BE = ED = 1, and angle ABE = 90 degrees.

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book Other Question

can some one please help me with this problem??

Solve the quadratic equation.

5t^2=240
please help i really don't get this...i've tried to figure it out but i don't know where to start.
Complete the sequence: 19, 5, 17, 21, 5, 14, 3, ____. Explain your answer.