Please help, really urgent. Someone measured the elevation angle of a mountain to be θ. After advancing a distance d in the horizontal direction to the mountain, the elevation angle of the mountain is measured to be ϕ. Seek the height of the mountain.

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50 points! antonio made a scale model of a building. the model's scale is 1 inch to 235 feet and its height is 3.5 inches. what is the exact height of the actual building? enter your answer in the box.

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882