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1.
you go to another forest and measure the shadow of a tree to be 6 meters long. the shadow of your meter
stick is 2 meters long. how tall is the tree?

The tree is 3 meters long.

How to solve: during these kinds of questions, you have to set up a proportion. What I like to do is write down what things are similar. For example, you know the SHADOW of your meter stick and tree. Then I would write down what I know and what I don’t. And in this case, it tells us that the stick is a meter (and hey the unit we are using to measure the shadow is meters) stick. What we don’t know is how tall is the tree. From there set up your proportion as:
1m (how tall the stick is) X(tree height)
————————————- = ———————-
2m (the shadow of stick). 6(shadow tr)

From there cross multiply

2x=6
Divide by 2
X=3
The tree is 3 m tall

The light is great source of energy