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What is the square footage of a house with the dimensions 30 feet by 40 feet?

The American National Standards Institute suggests using external measurements when calculating the square footage of a house. Any rooms that are not finished or heated like the rest of the house, such as an attic or a basement, should not be included in the total. A garage should also not be included as part of a house's square footage, though it is counted when calculating the footprint of a house.

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What fraction is equivalent to four fifths?

To find these equivalent fractions requires multiplying the top number, or numerator, and the bottom number, or denominator, by the same number. For instance, multiplying four by two makes the new numerator eight, and multiplying five by two makes the new denominator 10. The fraction 8/10 therefore is equivalent to four-fifths. Since 8/10 is written in decimal form as 0.8, the equivalent of four-fifths in decimal form is also 0.8

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What are numeric skills?

Also known as numerical reasoning ability, numeric skills exist in most children even before their education. Numeric skills affect many skills, but the most common are basic arithmetic operations, the ability to perform estimates, geometry and statistics.\n\nNumeric skills are considered to be largely innate and separate from formal mathematical education. Fundamental numeric skills include the ability to understand time, measurement and estimation. Without numeric skills, a person struggles to understand such daily things as working with patterns and functions to solve problems.

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How do you find the inverse secant?

The inverse secant can also be calculated from the inverse sine and inverse tangent functions. For a number x that is greater than 1, the inverse secant of x is equal to the inverse sine of the quantity square root of (x^2 - 1) divided by x. Alternatively, the inverse secant of x is equal to the inverse tangent of the quantity square root of (x^2 - 1), again provided that x is greater than 1.\nWhen x is less than 1, the inverse secant of x is equal to pi (approximately 3.14159) plus the inverse sine of the quantity (x^2 - 1) divided by x. Another formula for the inverse secant of x less that 1..

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How do you find the average of something?

Add up all the valuesAdd up all the numbers that you have to get a summation of the entire set of values. For instance, if you have 2, 3, 5 and 6, the sum would be 16.Count the number of valuesThe next step is to count the number of values that you have. For the example specified in step one, the count would be 4.Apply the formula Use the formula (average = sum/count) to obtain the average. For the previous example, the average would be (16/4 = 4).

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What are some examples using sinusoidal functions in real life?

As such, sinusoidal functions can be used to describe any phenomenon that displays a wave or wave-like pattern or by extension any predictable periodic behavior. They are applicable in many real life cases.The periodic rotations of a crankshaft in an engineThe rotation of a Ferris wheelThe fluctuating hours of daylight in a specific location throughout a calendar yearFluctuating use of energy to heat a home through the seasons.

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What is the next number in the series 13, 18, 16, 21, 19?

Recognizing a pattern within a sequence of numbers helps determine numbers that occur much later, often without writing down the entire sequence. Being able to recognize a pattern has additional applications, such as determining probability. There are some number sequences so common, they have a name. One example is the Fibonacci sequence, in which a number is the sum of the two previous numbers before it.

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Who invented division?

While the development of individual mathematical processes has not been attributed to a single educator or scientist, various people over time have advanced the practice. John Napier created logarithms in 1614 and, along with Henry Briggs, developed logarithms with a base of 10. After Napier's death, Briggs went on to create a logarithmic table that eventually included 30,000 natural numbers. However, Napier's work in trigonometry created the basis for calculations with logarithms, sines and cosines, which helped reduce complex mathematical functions to the more basic functions of ad..

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Who invented the quadratic formula?

The first quadratic equation was used in Egypt, and this equation was further expanded by the Greeks using geometric methods. Euclid's work, called "Data," solves equations with quadratic formulas, and "Arithmetica" by Diophantus also solves the quadratic formula. However, these early works did not utilize both a positive and negative root. Indian mathematicians may have used the quadratic formula to design altars dating back to 500 B.C. Other Hindu and Persian mathematicians invented rules for the quadratic formula.

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What is a skew line?

Skew lines only exist in three or more dimensions. Skew lines are groups of two or more lines that never meet, are not perpendicular and are not parallel. There are an infinite number of skew lines when dealing in three dimensions or more. Skew lines do not exist in two-dimensional geometry. There is a unique perpendicular line to each two skew lines. This is a line that intersects each of the skew lines and forms a 90-degree angle when intersecting.

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