book Maths Puzzle Numerical Ability

How do you isolate B2 in the following formula?

A=1/2h(b1+b2)

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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 2x^2 + x -10/-12 + 8x – x^2



2x^2 + 3x -9/ divide x^2 + 10x +24/
2x^2 – 13x + 15 x^2 + x – 30



8x/4-x - 5x/x-4



Divide

4i/6 + 5i


2y√[27