Correct Answer: C. Carbon dioxide

Explanation

Carbon dioxide is a trace gas in the atmosphere, but it plays a significant role in the greenhouse effect. It absorbs and traps heat from the Earth's surface, contributing to global warming.

Explanation

Airforce Base Secondary School,

P.M.B. 2364

Lagos.

12 May. 2005.

Dear Maurice,

I am indeed very sorry for failing to reply your last letter on time, in which you requested for some information about my school, so as to enable you decide on moving over to my school. I've been extremely busy because of my recent appointment as the senior prefect.

Well, I am happy that you requested for information about my school and I'll give you at least three areas in which my school excels. Firstly, my school is recognized nationwide as one of the best schools in Nigeria because of its academic excellence. The students in my school are well-taught in such a way that they are prepared for the challenges they might face educationally and socially in future. The teachers, who are qualified in their different areas of studies, ensure that we understand what they are teaching us. This has been helping us to perform brilliantly in our examinations. Our teachers ensure that they carry out their duties effectively and efficiently because they know that they play a very crucial role in our lives. This is the secret behind our brilliant performances in various external examinations.

Secondly, my school ensures that we have good etiquette and morals. The students exhibit good morals both within and outside the school. In fact, you cannot be a student of the school and display bad behaviour and morals. Just last year. my school appointed three teachers who are specialists in civics and moral education. Their job is to teach students good manners so that they can be disciplined men and women in future. The school does not tolerate bad behaviour and indiscipline of any kind and it ensures that students obey all the rules and regulations of the school. The school is doing this because it realises we are the future leaders of this great country who will lead Nigeria to greatness.

Thirdly. my school has well-equipped facilities which make learning interesting to its students. It provides all the necessary academic facilities for the academic growth and development of the students. It has a big library that is well-stocked with relevant books and teaching aids which are used in teaching. The library is air-conditioned and students are allowed to read in the library and to borrow books or educational journals, but students are always discouraged from writing notes on them. Our laboratories for science students are well-equipped with all necessary apparatus and chemicals; they are second to none in the state Sporting facilities like football field, basketball and tennis courts are avail-able.

Dear Maurice as your best friend. I want the best for you I want you to mover over to my school because it will make learning easier for you How are you? I hope that you are fine Convey my greetings to Peter and David. I hope they are making progress too In their studies.

Yours sincerely,

lmeh.

Explanation

\(y = 3 + 2x - x^{2}\) and \(y = 2x - 3\)

Table of values for the equation for \(-3 \leq x \leq 4\)

(i) \(6 - x^{2} = 0\)

\(6 - 3 + 2x - x^{2} = 2x - 3\)

\(3 + 2x - x^{2} = 2x - 3\)

\(\therefore y = 2x - 3\)

Read the point where the two equations intersect on the graph.

x = -2.6 and x = 2.5.

(ii) Maximum value of \(3 + 2x - x^{2}\) is at y = 4.

(iii) Range for which \(3 + 2x - x^{2} \leq 1\) is represented by the shaded portion in the graph.

Correct Answer: A. 0.5

Explanation

y = k\(\sqrt{x}\) when y = 1, x = 4

k = \(\frac{y}{\sqrt{x}}\)

= \(\frac{1}{\sqrt{4}}\)

= \(\frac{1}{2}\)

= 0.5

Correct Answer: C. euphemism

Correct Answer: A. it marks the beginning of Hajj rites

Correct Answer: C. the final Judgement of God

Correct Answer: B) 0.579

Explanation

To solve this problem, we need to find the mole fraction of oxygen. The mole fraction is the ratio of the partial pressure of a specific gas to the total pressure of the gas mixture.

The formula for calculating the mole fraction is:

\(X_{O_2} = \frac{P_{O_2}}{P_{total}}\)

Where \(X_{O_2}\) is the mole fraction of oxygen, \(P_{O_2}\) is the partial pressure of oxygen, and \(P_{total}\) is the total pressure of the gas mixture.

Given the partial pressure of oxygen (\(P_{O_2} = 452 mmHg\)) and the total pressure (\(P_{total} = 780 mmHg\)), we can substitute these values into the formula:

\(X_{O_2} = \frac{452}{780}\)

After calculating, we get:

\(X_{O_2} = 0.579\)

Thus, the mole fraction of oxygen is 0.579, which corresponds toOption B.

It's important to understand that the mole fraction is a dimensionless quantity that represents the proportion of one substance in a mixture. In this case, it indicates the proportion of oxygen in the air sample. Mole fraction is useful for calculating various properties of gas mixtures, such as partial pressures and concentration of each component.

Correct Answer: C. As it was very cold, he did not go out

Correct Answer: D. mining

Explanation

Extractive occupation is concerned with making available raw materials and natural products from land or sea e.g farming, fishing, mining, hunting etc.