An electronic calculator is a small, portable electronic device used to perform both arithmetic operations and complex mathematical operations.

The first solid electronic calculator was created in the 1960s, building on the extensive history of tools such as the abacus (developed around 2000 BC), and the mechanical calculator (developed in the 17^th century AD). It was developed in parallel with the analog computers of the day.

In addition to general purpose of calculators, there are those designed for specific markets, for example, there are scientific calculators which include trigonometric and statistical calculations. Some calculators even have the ability to do computer algebra. Graphing calculators can be used to graph functions defined on the real line, or higher dimensional Euclidean space.

What is the meaning of “extensive” in the second paragraph?

A laptop is a kind of computer unit which has the same function as a PC (Personal Computer), but it’s smaller, lighter and of different sizes. Nowadays, most people choose laptops for several reasons.

A laptop is a portable device. This portability is very helpful for our work, study and other activities. We do not need complicated cable installations to activate a laptop. With a laptop, we can do our work anytime and anywhere.

Moreover, a laptop allows us to access the internet in public places which provide free access called hot spot areas. Some people like to use this facility to carry out their tasks.

Finally, a laptop consumes energy more efficiently than a PC does. This device uses a rechargeable battery as a source of electric energy. So, if we prefer using a laptop, it means that we support the government program to save energy. That’s why a laptop has become very popular recently.

What is the purpose of the text above?

Earthquake

Earthquake is a sudden shaking of the earth’s surface that often causes a lot of damage. It is the result of a sudden release of stored energy in the Earth’s crust that creates seismic waves. Earthquakes may happen naturally or as a result of human activities. Smaller earthquakes can also be caused by volcanic activity, landslides, mine, blasts, and nuclear experiments.

What is the purpose of the paragraph?

Earthquake is a sudden shaking of the earth’s surface that often causes a lot of damage. It is the result of a sudden release of stored energy in the Earth’s crust that creates seismic waves. Earthquakes may happen naturally or as a result of human activities. Smaller earthquakes can also be caused by volcanic activity, landslides, mine, blasts, and nuclear experiments.

What is an earthquake?

Which statement is the definition of factual report?

The polar bear is a bear native to the Arctic Ocean and its surrounding seas. An adult male weighs about four hundred to six hundred and eighty kilograms, while an adult female is about half that size. Although it is closely related to the brown bear, it has paws to occupy a narrow ecological niche with many bony characteristics adapted to for cold temperatures, for moving across the snow, ice, open water, and for hunting seals which make up most of its diets. Although most of polar bears are born on land, it spends most of its time at sea, hence its name meaning maritime bear and can hunt consistently only from sea ice. It spends much of the year on frozen sea.

What does the adult male bear weigh?

The polar bear is a bear native to the Arctic Ocean and its surrounding seas. An adult male weighs about four hundred to six hundred and eighty kilograms, while an adult female is about half that size. Although it is closely related to the brown bear, it has paws to occupy a narrow ecological niche with many bony characteristics adapted to for cold temperatures, for moving across the snow, ice, open water, and for hunting seals which make up most of its diets. Although most of polar bears are born on land, it spends most of its time at sea, hence its name meaning maritime bear and can hunt consistently only from sea ice. It spends much of the year on frozen sea.

Where did the animal live?

Whales are sea-living mammals. They therefore breathe air but cannot survive or land. Some species are very large indeed and the blue whale, which can exceed 30 meter length, is the largest animal which lives on earth. Superficially, the whale looks rather like a fish, but there are important difference in its external structure; its tail consists of a pair of broad, flat horizontal paddles (the tail of a fish is vertical) and it has a single nostril on top of its breadth, broad head. The skin is smooth and shiny and beneath it lies a layer of flat (blubber). This is up to 30 meter in thickness and serves to conserve heat and body fluids.

What is the text about?

Whales are sea-living mammals. They therefore breathe air but cannot survive or land. Some species are very large indeed and the blue whale, which can exceed 30 meter length, is the largest animal which lives on earth. Superficially, the whale looks rather like a fish, but there are important difference in its external structure; its tail consists of a pair of broad, flat horizontal paddles (the tail of a fish is vertical) and it has a single nostril on top of its breadth, broad head. The skin is smooth and shiny and beneath it lies a layer of flat (blubber). This is up to 30 meter in thickness and serves to conserve heat and body fluids.

The length of a whale is……..