exam Maths Puzzle Numerical Ability

If the roof is 7cm from the peak to the eave and the attic space is 3cm high at the peak, how long does each of the pieces of insulation need to be? Round to the nearest tenth.

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Please help me solve this equation:

(4)/(m^2-7)=1

Thank you for your help! a dorm room at a college your sister is considering seems small. The room is rectangular and has a perimeter of 42 feet. The room is 4 feet longer than it is wide. what are the dimensions of the room