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How many sides does a nonagon have?

A nonagon is an uncommon polygon compared to other polygons like hexagons or octagons. A regular nonagon is a shape where all nine sides are the same length, which consequently means that all internal angles are equal at 140 degrees. Along with nine sides, a nonagon has nine vertices and 27 possible diagonals that can be drawn from vertex to vertex. The most closely related polygons are the eight-sided octagon, like a stop sign, and the 10-sided decagon.

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How many 80-pound bags of concrete equal a yard?

Before pouring the slab, use concrete forms made of 2x4 or 2x6 lumber, depending on the depth of the slab preferred. Excavate the slab area to a depth 3 inches deeper than the slab desired, place and tamper 3 inches of gravel to give the slab a base upon which to sit. After pouring and leveling the concrete, remember to let it cure.

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Who created numbers?

The next-oldest numerical system after the Babylonian base-60 system, and the first base-10 counting system known to man, was developed by the ancient Egyptians. Although this system used a specific hieroglyph for each power of 10, it did not have a symbol for zero. However, ancient Egyptian society spans 3,000 years of history, and much of human knowledge of this society is based on records from relatively late periods in ancient Egyptian history. For example, no records of mathematical systems that existed at the time of the construction of the pyramids of Giza exist, although such structure..

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How do I work out the measurements of a room in square meters?

For example, if a room is 4 meters wide and 5 meters long, the area of the room is 20 square meters. This measurement is often needed to determine the amount of floor covering that is needed. When the area of a room is known, an estimate of the cost of the floor covering is also possible. Multiply the carpet cost per meter by the area of the room. For instance, if carpet is $30 per square meter, covering a 20-square-meter floor costs approximately $600.

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What are some adoption statistics?

The Coalition points out that as of 2014, 397,122 children are without permanent families in the foster care system. They write that 101,666 of these children are eligible for adoption, but almost 32 percent of them will wait in the foster care system at least three years before they can be adopted. The Coalition reports that of the 23,396 young people that aged out of the foster care system in 2012, 40 percent of them have been without a home, 60 percent of them have been convicted of a crime, 50 percent of them have had issues with substance abuse and only 48 percent were employed at the tim..

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What is the definition of data inconsistency?

The duplicated data, also known as the redundant data, creates unreliable information because the chances of having a value changed in one file are high, but on the other file the value remains the same. This condition of inconsistency is often experienced when using the traditional file processing, and it is very expensive and difficult to rectify such inconsistencies. For example, if a hospital is using the traditional file processing, changing the address of a patient will cause changes in several other files because they are kept separately. Inevitably, a case would arise where the address..

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What are some highly rated online pre-algebra courses?

The ALISON online pre-algebra course is designed for high school students and focuses on core topics such as one-step equations, percentages, integers and probabilities. The course also introduces students to geometric concepts and right triangles. There are 12 modules in the course, and these are divided into several lessons, allowing students to pace themselves as they learn. After completing all modules, students can expect to know different ways to solve the same equations, the coordinate system and the mathematical order of operations. Students who score at least 80 percent on all course ..

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What is the square root of 225?

A perfect square is achieved by taking a positive integer and multiply it by itself. Examples of perfect squares are 1, 4, 9, 16, 25 and 225.\nEvery mathematical operation has an inverse operation. The inverse operation of finding a square root is squaring a number. Squaring a number is simply multiplying that number by itself. For example, to square 15 means to multiply 15 by 15, which equals 225.

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What are some concepts for online high school algebra?

Online high school algebra covers the properties of real numbers. It goes over how to solve single variable equations. It also covers how to solve systems of equations and inequalities by graphing and using an algebraic approach.\nThe course teaches students how to find the slope of a line given two points and write linear equations in standard form and point slope form. It also discusses how to find the X- and Y-intercepts of a line.\nOnline algebra courses teach rules concerning exponents and exponential functions. Students can use these rules to simplify expressions. The course also covers ..

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How do you find the range?

Find the highest and the lowestIn a given set of numbers, look for the highest and the lowest numbers. These will be the numbers that determine the range of a set. For instance, a set of 1,3,4,4,7 has a highest of 7, and a lowest of 1. Calculate the differenceOnce the highest and lowest numbers are determined, the highest is subtracted by the lowest. Using the numbers from the previous step, 7 minus 1 would equal 6. This result, known as the difference, is the range of the set of numbers.\n\nThe equation looks like this:\n\n7 - 1 = 6\n\nThe range of the previous set is 6.Determining range with..

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