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# Tutor profile: Lidia G.

Inactive
Lidia G.
Tutor for 15 years, Experience in Teaching Math and Statistics in High School and University
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## Questions

### Subject:Trigonometry

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Question:

A person located at a lighthouse sees a boat, the angle of depression to the boat is 55 degrees. What is the distance from the base of lighthouse to the boat if the person at the top of the lighthouse is located 40 meters above sea level?

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Lidia G.

The distance from the lighthouse to the boat is approximately 19 meters.

### Subject:Pre-Algebra

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Question:

If a number is increased by 12 it becomes 100. Find the number.

Inactive
Lidia G.

If a number is increased by 12 it becomes 100. The number should be 88.

### Subject:Algebra

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Question:

A chemist has a 10 ml solution that has a concentration of 30% of acid. How many ml of acid need to be added to increase the concentration to 50% of acid?

Inactive
Lidia G.

To increase the concentration of the solution from 30% to 50%, 4 ml of acid need to be added to the original solution.

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