A mathematical equation is an expression containing two mathematical objects connected by an equals sign (=) . The equals sign says that both sides are exactly equal, or of the same value. An equation can be as simple as x=0, or as complex as formula_1 or harder.
There are two kinds of mathematical equations:
The second kind is often used to solve problems in which finding the value of some variables is involved. For example, if
The second kind of equation is used in algebra. For example, to solve the equation 2x = 8 for x, one would follow an algebraic rule to find that x = 4.
Equations can be classified by the types of operations and quantities involved. For example:
1961
1961 (MCMLXI) was . Its rendering using the Hindu-Arabic numeral system creates a numeral which looks the same when put upside down. The next such year will be 6009.
1783
1809
1968
1968 (MCMLXVIII) was .
October 31
Canteen
A canteen can be:
Beadle
A beadle is someone who works at a church or a Jewish synagogue and helps the clergy. A beadle's main job is to show people to their seats and to keep order during church services.
Like many words that describe a person's job, the word beadle can also be used as a last name.
1947
July 17
Vegetable
Vegetables are parts of plants that are eaten by humans as food as part of a meal. This meaning is often used: it is applied to plants to mean all edible plant matter, including the flowers, fruits, stems, leaves, roots, and seeds.
Carrots and potatoes are parts of the root of the plants, but since they are eaten by humans, they are vegetables. They are not in the same category as a fruit, nut, herb, spice, or grain. Though tomatoes are often thought of as vegetables, but because they have seeds, they are, botanically, fruits. Vegetables are an important part of people's diet. Vegetables and fruits are sometimes called produce. Vegetables have vitamins A, B, C, D, minerals and carbohydrates.
The USDA Dietary Guidelines for Americans recommends eating five to nine servings of fruit and vegetables everyday. The total amount eaten varies depending on age and gender.
The word vegetable was first recorded in English in the early 15th century. It comes from Old French. It is gotten from Medieval Latin vegetabilis "growing, flourishing" (i.e. of a plant).
The meaning of "vegetable" as a "plant grown for food" was not accepted until the 18th century. The year 1955 saw the first use of the slang term "veggie".
The word "vegetable" can also be used to mean plants in general, such as when people say "Animal, Vegetable, or Mineral."
However, in an Asian context, 'vegetable' may mean any plant produce, apart from grain and nuts, that is eaten cooked, while only the fruits eaten raw are considered as 'fruits'. For example, an artichoke is thought to be a vegetable, while a melon has the features of a fruit.
"Fruit" has a botanical meaning. Peaches, plums, and oranges are known as "fruits". Many plants commonly called "vegetables", such as eggplants, bell peppers, and tomatoes, are fruits in botany. The question of is a tomato a fruit or a vegetable was asked in the United States Supreme Court in 1893. The court ruled that a tomato is, and thus taxed as, a vegetable. This was for the Tariff of 1883 on imported produce. But the court knew that a tomato is a fruit in botany.
Before agriculture, humans were hunter-gatherers. They looked for fruit, nuts, stems, leaves, corms, and tubers, scavenged for dead animals and hunted living ones for food. Growing crops in a forest clearing is thought to be the first example of agriculture. Useful types of plant were grown while unwanted plants were removed. Plant breeding through the selection of plant with wanted characteristics such as large fruit and fast growth soon started.
It is likely that many people around the world started growing crops in the period 10,000 BC to 7,000 BC. Subsistence agriculture was the earliest form of agriculture. It involves the growing of crops by people to produce enough food for their families. Anything left is used for exchange for other goods.
Throughout history, the rich have been able to afford different kinds of food including meat, vegetables and fruit. But for poor people, the food they ate was very dull. It is usually made up of mainly some staple product made from rice, rye, barley, wheat, millet or maize. The addition of vegetable gave some variety to the diet.
Vegetables are very important in human nutrition. Most vegetables are low in calories but are large and filling. They are a source of dietary fiber, essential vitamins, minerals, and trace elements.
When people eat more vegetables, it reduces the incidence of cancer, stroke, cardiovascular disease, and other chronic ailments. The amount of nutrients of each vegetable is different. Some have useful amounts of protein though and varying proportions of vitamins such as vitamin A, vitamin K, and vitamin B, provitamins, minerals; and carbohydrates.
Vegetables are commonly eaten raw. It may become contaminated when they are made by an infected food handler. Hygiene is important when handling foods to be eaten raw. These vegetables need to be properly cleaned, handled, and stored to stop contamination.
Vegetables have been big part of what humans eat. Some vegetables are perennial crops but most are annual and biennial crops. Cultivation of vegetables follows a particular pattern. The pattern is usually followed like this:
On a small garden, tools like the spade, fork, and hoe are used. On commercial farms, mechanical equipments are used. These include tractors, ploughs, harrows, transplanters, cultivators, irrigation equipment, and harvesters.
When a vegetable has matured it is ready to be harvested for storage or sale. There should be little damage and bruising to the crop when harvesting. Before storage or sale, damaged goods should be removed and produce should be picked according to its quality, size, ripeness, and color.
All vegetables have to be stored to make them available all year round. A large proportion of vegetables are lost after harvest during the storage period. The main causes of loss include spoilage caused by moisture, moulds, micro-organisms, and pests.
Storage can be short-term or long-term. During storage, leafy vegetables lose moisture, and the vitamin C in them is lost quickly.
Cold storage is useful for vegetables like cauliflower, eggplant, lettuce, radish, spinach, potatoes, and tomatoes. Storage of fruit and vegetables in controlled atmospheres with high levels of carbon dioxide or high oxygen levels can stop microorganisms from growing.
The reason why vegetables are preserved is to make them available all year round. The goal is to harvest the food when it is mature with a high nutritional value, and preserve these qualities for a longer period of time. The main causes of spoilage during storage are the actions of naturally-occurring enzymes and micro-organisms. There are many ways to preserve vegetables and they are:
In 2010, China was the largest vegetable producing nation, with over half the world's production. India, the United States, Turkey, Iran, and Egypt were the next largest producers. Here is a table with the needed information.
Olivine
Olivine (or chrysolite) is a silicate mineral made of magnesium iron silicate with the formula (Mg,Fe)2SiO4.
It ranges in colour from chartreuse green to pale olive. In its gem form, it is called peridot.
Dunite is a rock of 90%+ olivine. Dunite and other peridotite rocks are major constituents of the Earth's mantle above a depth of about 400 kilometers. Dunite is rarely found on land, except where slabs of mantle rock from a subduction zone have been thrust onto continental crust.
Olivine has also been found at several extraterrestrial locations, such as the moon and many passing space rocks - as well as the outer layers of dust orbiting young stars.
May 18
30 BC