Hi Can you guys help me with this question? I don't remember what to do

This is what I know.A survey team is trying to estimate the height of a mountain above a level plain. From one point on the plain, they observe that the angle of elevation to the top of the mountain is 30 degrees. From a point 1500 feet closer to the mountain along the plain, they find that the angle of elevation is 34 degrees

How high (in feet) is the mountain?

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I need to solve for Z so.. I just remeber that you need to solve for x and then z.

tan 30 = z/1500+x

tan 43 = z/1500+x

It's something like that but I do not remember.