2x + 4 = 15

2x= 15 - 4

2x = 11

x = 11/2

A colony of 250,000 ants call the average anthill home — here's what inside their mound. "Ant nests" are the physical spaces in which the ants live. These can be underground, in trees, under rocks, or even inside a single acorn. The name "anthill" applies to underground nests where the workers pile sand or soil outside the entrance, forming a large mound.

Sufism is a mystic tradition of Islam that includes a range of beliefs and practices dedicated to Allah, divine love and cultivation of the heart. On the other hand, Bhakti stands for complete devotion to one particular deity. Both Sufism and Bhakti started as an answer to the ever-growing orthodoxy of various religions. 

Glands are important organs located throughout the body. They produce and release substances that perform certain functions. Though you have many glands throughout your body, they fall into two types: endocrine and exocrine.

Migration is the movement of people across different states and regions. When people migrate within the boundaries of the country, it is called internal migration. International migration refers to the migration of people between countries. Migration is an important determinant of population change as it not only changes the size of population but also affects the population composition of urban and rural areas. If we take an example of India, we find that the urban population of the country has increased from 17.2% in 1951 to 27.7% in 2001 due to the migration of people from villages to the cities in search for better job opportunities.

In some countries, freedom of political expression, freedom of speech, freedom of the press, and internet democracy are considered important to ensure that voters are well informed, enabling them to vote according to their own interests. The nature of democracy is that elected officials are accountable to the people, and they must return to the voters at prescribed intervals to seek their mandate to continue in office. Pre-decided or fixed election dates have the advantage of fairness and predictability. All have equal right to choose their government. They form a stable government because it is based on public support. The administration is conducted with a sense of responsibility. In representative democracy, people's representatives discuss matters more thoroughly and take reasonable decision.

Stomach

• Stomach is a flattened U shaped thick walled bag and widest part of the alimentary canal.
• It receives food from oesophagus at one end and pushes the food down into small intestine at the other end.

By conduction: The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction. The conduction process takes place only in solids.  For example, a spoon in a pot of soup heats up by conduction

All the materials do not allow the heat to pass through them. The materials which allow the heat to pass through them easily are called conductors. For example – iron, aluminium and copper.

The materials which do not allow the heat to pass through them easily are poor conductors of heat and are called insulators. For example – plastic and wood.

he air that we breathe is a mixture of many gases like oxygen, nitrogen, carbon dioxide, argon etc. The majority of the atmosphere is made up of nitrogen (78%) and oxygen (21%). The other gases that are present in small quantities are: Carbon dioxide (0.03%), Argon (0.93%) and Others ( helium, hydrogen, ozone). Tiny dust particles are also present in the air, apart from the above gases.

Oceans are extremely important to human life. The following are the importance of oceans: 

• Fish is an important source of food and nutrition to human life. Fishes have been consumed by man since prehistoric times. 
• Fishing has become a well developed industry today and significantly contributes to the economy of many nations. 
• Oceans provide food and other marine products to humans. Several kinds of edible oil are manufactured by humans from marine animals. 
• Besides food and oil, marine animals and plants provide leather, glue, cattle feed etc. 
• Much research is being done to extract essential oil and products of marine life that can cure different diseases. Marine pharmacologists are researching on the physical and chemical properties of marine organisms like crabs, sea cucumbers, sharks, cods etc. 
• Oceans provide us with a variety of mineral resources. Some of these are common salt, magnesium and bromide. 
• The most important minerals obtained from the sea are petroleum and natural gas. Petroleum known as ‘Black Gold’ is mainly found in the continental shelves and slopes. Bombay High in India is an important source of oil in India. 
• Oceans also provide us with non conventional sources of energy like tidal energy and the energy generated through waves. The rise and fall of sea water is known as the tides. Powerful tidal waves generate huge amounts of force when they strike the shore. This energy is used by generators to produce electricity. 
• Many countries are researching the prospects of harassing energy from the surface of the ocean waters. The water at the surface of the sea in the tropical regions may reach upto 300C. Belgium and Cuba have designed floating generators that can be used for the production of electricity. 
• Oceans have been used as a means of transport since ancient times. Water transport is one of the cheapest means of transport in the world. 
• Oceans also regulate the temperature of the Earth. They cover about 71% of the Earth’s surface. They store the heat of the Sun and keep the Earth warm. This is because they absorb the heat of the Sun and release it after a long time. On the other hand, land gets heated and releases heat quickly. Had the land been greater than water, the former would have remained frozen for most time of the year.

The twisted tobacco leaves did resemble the curly tail of a pig, so they were called “pigtails." Eventually, the term began to be used to describe hair braids that resembled the twisted tobacco leaves. Pigtails were very popular among soldiers and sailors in the 1700s. Another popular hairstyle is the ponytail. A pigtail wire is a short length of wire that connects at one end to a screw terminal on an electrical device, with the other end joined to circuit wires with a wire connector (wire nut).

Universal adult franchise means that every person above the age of 18 have the right to vote. This is important to democracy because it is based on the principle of equality. It does not discriminate on the basis of social or economic backgrounds.