from a window in a building on one side of a street 40m wide , the angle of elevation to the top of a building across the street is 30° and the angle of depression to the foot of the building is 28°. Calculate the height of the building on the opposite side of the street if both buildings lie on the same horizontal plane.

it is x equals 3   plese mark me really need it

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it is not that hard all u have to do is plot the graph

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probably the last option

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1^3 + 2^3 + 3^3 +4^3 = (1+2+3+4)^2

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i am only able to answer the first part. i am not sure about the second part. sorry