Let f and s be the ages of the father and the son. We have
From the first equation we derive
Substitute this expression for f in the second equation and we have
The solutions to this equation are s=5 or s=37
Since the sum of the ages must be 42, the solutions would imply
We can only accept the first solution, since the second would imply a son older than his father!
The first step for this problem should always be to draw out the triangle so that you can right down the angles and side lengths. Afterward, you can use SOHCAHTOA to find the height of the tree. You would use tangent. The equation you would use is tan(28°)x/18. After solving for x, you will find the answer which is approximately 9.57 feet.
Hope this helped :)
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You forgot to give us an image, please go do that
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I believe the answer is C. 674 because the surface area of the pyramid is approx. 682.64569.
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I'm sorry I could be of more help.
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I cant see the reference image so I dont have enough info to help. Srry :(
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