Explanation

(a) The term flooding:Flooding is the covering of the surface of the earth with water, resulting from temporary rise in the level of a river, lake or other water bodies.

(b) Causes: The causes are as follows:

(i) Heavy rainfall.

(ii) Blockage of drainage and water ways.

(iii) Encroachment on water courses by settlement.

(iv) Ground water coming out from over-saturated aquifer.

(v) Rivers overflowing their banks.

(vi) Release of excess water from reservoirs or dams.

(vii) The collapse of dams and rise in sea level.

(c) Effects: Flood would result in the following:

(i) Destruction of farmland.

(ii) Destruction of houses and properties.

(iii) Loss of life.

(iv) Shortage of food and high cost of food

(v) Outbreak of diseases and epidemics

(vi) Causes landslides and mudflow.

(vii) Temporary stoppage of economic activities such as schooling, marketing etc

(viii) Contamination of source of domestic water.

(d) Measures of control;

(i) Channelization

(ii) Enforcing environmental laws.

(iii) Clearing of drainage channels regularly.

(iv) Dredging of river course.

(v) Regular maintenance of dams.

Correct Answer: A. An increase in demand for X will increase supply of Y

Correct Answer: A. because he was forced to

Correct Answer: D. √13

Correct Answer: A. money supply

Explanation

Commercial bank refers to a financial institution that accepts deposits, offers cheque account services, makes various loans etc. The deposits of commercial banks make up part of the money supply in an economy, which is the total amount of money in circulation or in existence in a country

Correct Answer: D. iron

Explanation

The correct answer is D. iron.

Explanation:

• Sodium and calcium are highly reactive metals that react vigorously with cold water.

• Copper is very unreactive and does not react with water or steam even when heated.

• Iron reacts very slowly with cold water (rusting in the presence of oxygen), but when it is heated until it is red-hot, it reacts reversibly with steam to form triiron tetroxide (Fe_3O_4) and hydrogen gas (H_2):

3Fe_{(s)} + 4H_2O_{(g)} \rightleftharpoons Fe_3O_{4(s)} + 4H_{2(g)}

Correct Answer: B. information is prepared based on evidence

Explanation

Information presented in the report can be relied on as the accurate description of the transaction of the enterprise and show a true and fair view.

Explanation

(a)(i) Scale : On x- axis, 2cm = 1 unit

On y- axis, 2cm = 5 units.

(ii) Equation of line of symmetry is x = 1.25.

(iii) Roots of the equation \(ax^{2} + bx + c = 0\) are x = 0.25 and x = 2.25.

(b) Coordinates are D(0, 1), E(1, -2) and G(3, 4).

Substituting for y and x in \(ax^{2} + bx + c = y\)

D(0, 1) : \(1 = a(0^{2}) + b(0) + c \implies c = 1\)

E(1, -2) : \(-2 = a(1^{2}) + b(1) + c \implies -2 = a + b + c\)

\(a + b = -2 - 1 = -3 ... (1)\)

G(3, 4) : \(4 = a(3^{2}) + b(3) + c \implies 4 = 9a + 3b + c\)

\(9a + 3b = 4 - 1 = 3 ... (2)\)

\(\implies 3a + b = 1 ... (2a)\)

(2a) - (1) : \(2a = 4 \implies a = 2\)

\(a + b = -3 \implies 2 + b = -3\)

\(b = -3 - 2 = -5\)

\(\therefore\) The equation is \(y = 2x^{2} - 5x + 1\)

(c) The greatest value of y = 33.5.

Correct Answer: C. Regulates supply and demand

Correct Answer: B. Recording