A mirror is placed on the ground 12 m from directly under the traffic light. Bardia walks backward until he can see the top of the traffic light in the mirror. He is 4.2 m from the mirror and his eyes are 1.85 above the ground. Determine how high the traffic light is hanging from the pole using triangle similarity. (round to 1 dp)

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Power Operation

Power operation is topic of algebra in Math. It is use to represent repeated multiplication. Very big number and very small number can be easily express using power operation. Power operation is useful in many fields. In space engineering, it helps in representing the distance or size of particular heavenly body. In medical field, it is used to represent very small size. In medical field it helps to mention size of bacteria or virus. 

Exponents

The exponent or power or index of a variable/number is the number of times that variable/number is multiplied by itself.