book Maths Puzzle Numerical Ability

a. Find the area of a rectangle with sides 2x-7 and x+14
b. A rectangle has sides (x+9) and (2x+15). Find x if its perimeter is to be 300 units.

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book Other Question
what is 5 radical 2 squared? A electronics store wants to order at least 3 times as many DVD players as VHS players. Write an inequality expressing this relationship.