exam Maths Puzzle Numerical Ability

a dead tree was struck by lightening causing it to fall over at a point 10ft up from the base of the tree.
if the fallen treetop forms a 40 degree angle with the ground, about how tall was the tree originally?

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PLEASE HELP

The lenght of a rectangle is 1ft more then twice its width, and the area of the rectangle is 45ft^2. I am trying to find the diensions of the rectangle.
Length _____ft
Width _____ft

THANK YOU IN ADVANCE Please could someone help with the following question:

If log {100√x}over y(4) = a log x + b log y + c, find the values of a, b and c.

I would be very grateful if someo