book Maths Puzzle Numerical Ability

CAN YOU PLEASE GIVE ME THE ANSWER FOR 7a to the third power-2a squared+6-7a squared+2a-4

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is 0.282882888... a rational number? A porch roof sloping at 45 degrees accumulated snow to a depth of 30 cm. The roof measured 3.0m x 5.0m. If the density of snow was 15 kg/m^2, what was the weight of the snow, in po