book Maths Puzzle Numerical Ability

i need help on intregers. i dont know any rules about them or how to use them please help me!!!!

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book Other Question

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 Graph:
2x-5y>-10

Can some one help me!