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For Grade 11 Natural science students you can evaluate your self by this question @yeshanehtube

The Formula of Harmonic Mean (H) H=2ab/a+b The harmonic mean is particularly useful in situations where rates or speeds are involved, especially when dealing with averages over equal distances or time intervals. Some common applications include: 1. Average Speeds: - In scenarios where an object or vehicle travels equal distances at different speeds, the harmonic mean provides a more accurate representation of the average speed. 2. Networks and Rates: - In networking and telecommunications, the harmonic mean is used to calculate average data rates. 3. Physics and Engineering: - It's employed in physics and engineering contexts, especially when dealing with resistances, currents, or speeds. 4. Finance: - In finance, the harmonic mean is used to calculate the average rate of return over multiple time periods. 5. Environmental Science: - Ecologists use the harmonic mean for calculating average growth rates in populations. The harmonic mean is valuable in situations where there is an inverse relationship between the two variables being averaged. It ensures that extreme values do not disproportionately influence the average.

☞︎︎︎ Questions 1. Look out! you........... the cup of milk. A, are going to spill B, are spilling 2. A: I am hungry. B: I....... a sandwich. A, will make B, am going to makes 3. A: What are you doing this afternoon? B: I am not sure. I.......probably do my home work. A, may B, will C, am going to 4.It is 7pm and the sun is going down. It.........dark. A, is going to be B, will be 5. Look at the line, it........a longe time to get table. A, will take B, is going to take ✔︎Answers 1.A 2.A 3.B 4.A 5.B

✔︎ CLAUSES of CONCESSION Clauses of concession typically have a subordinate conjunction followed by a subject and a verb. Here are common forms: 1. Although + Subject + Verb: - *Although it was raining, they went for a walk.* 2. Even though + Subject + Verb: - *Even though she studied hard, she didn't pass the exam.* 3. Though + Subject + Verb: - *Though it was cold, he went swimming.* 4. While + Subject + Verb: - *While they disagreed, they remained friends.* These structures introduce a contrasting idea, emphasizing a concession or unexpected outcome given the circumstances mentioned in the main clause.

Some of CLAUSES of CONCESSION "despite," "in spite of," "yet," "but," "however," "nevertheless," and "even if" can all be considered as elements of concession, as they introduce contrasting ideas. They are often used to convey unexpected or opposing situations. Here are examples: 1. Despite/In spite of + Noun/Verb-ing: - *Despite the rain, they enjoyed the picnic.* - *In spite of failing the first time, she tried again.* 2. Yet/But/However/Nevertheless + Independent Clause: - *He studied hard, yet he didn't perform well.* - *She was tired, but she continued working.* 3. Even if + Subject + Verb: - *Even if it rains, the event will go on.* These conjunctions and phrases help create a sense of concession by presenting contrasting or unexpected information within a sentence. ☝︎☝︎☝︎☝︎☝︎★✔︎✔︎

CONJUNCTIONS in ENGLISH 1. Coordinating Conjunctions: - *and, but, or, nor, for, so, yet* 2. Subordinating Conjunctions: - *although, because, if, since, unless, when, while* 3. Correlative Conjunctions: - *both...and, either...or, neither...nor, not only...but also, whether...or* 4. Conjunctive Adverbs: - *however, therefore, moreover, nevertheless, consequently* 5. Time Conjunctions: - *before, after, when, while, until* These conjunctions serve various functions in connecting words, phrases, or clauses within sentences to convey relationships and logical connections.

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