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What is the division sign called?

The earliest known usage of the "obelus" was in the 1659 publication of the Swiss mathematician Johann Heinrich Rahn's book, "Teutsche Algebr." In computers, a virgule is also called a "forward slash," which is one of the keys in a standard keyboard. Aside from being a mathematical sign, the "virgule" is also used as a separator in various date formats.

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What is an example of a covariance matrix?

The dispersion matrix has the variance of the different elements as the main diagonal. All the elements off the main diagonal are the respective covariance between the elements. The covariance between the elements (i,j) is similar to (j,i) , this property is referred to us symmetry. Due to its symmetric property each covariance is displayed twice within the matrix.\n\nIn data analytics, the case of multivariate data sets is quite normal, in order to check for variation within the variables, the applications of mathematical formulas that employ the covariance concept come in handy. One of thes..

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How do you find the vertex of a quadratic function?

Determine the coefficients of the equationAfter confirming that the given quadratic equation is in its common form of y = ax^2 + bx + c, identify the values of the coefficients a, b and c. For example, the quadratic equation y = 2x^2 - x + 4 has coefficients of a = 2, b = -1 and c = 4.Use the x-coordinate vertex formulaThe vertex formula for the x-coordinate is x = -b / (2a). While paying attention to any negative signs, plug the appropriate coefficient values into the formula, and solve for x. The quadratic equation y = 2x^2 - x + 4 has an x-coordinate of 0.25.Plug the x-coordinate into the ..

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What is Occam's razor?

The principle originated in the 14th century and is attributed to William of Ockham. William was a Franciscan friar and logician. The principle is stated multiple ways, but the most practical application is in decision-making. To apply Occam's razor when reviewing two potential theories with similar outcomes, choose the theory that is the simplest. Historically, Occam's razor has been applied to rule out theories that make too many assumptions that cannot be observed.\nOccam's razor is not a restatement of Aristotle's principle of simplicity, and the two are not applied sim..

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What is an example of distributive property of multiplication over addition?

The distributive property is an algebraic concept, which is why the example has letters. The same holds true with numbers: 2(4 + 5) = (2*4 + 2*5). In this problem, 4 + 5 = 9 and 9 x 2 = 18. Similarly, 2 x 4 = 8, 2 x 5 = 10 and 8 + 10 = 18. Whichever way the problem is worked, the result is the same.

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How is "exponential math" defined?

An exponent can be any number, positive or negative. An exponent can be a fraction, an integer or an irrational number like pi. An exponent can be a complex term with variables, for example 2^(2x +1) means 2 raised to the power of the quantity 2x + 1. Increasing the exponent causes the result to grow dramatically. While 4^2 = 16, 4^3 = 64, and 4^4 = 256. This rapid increase is called exponential growth.

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What number is XIX?

The Ancient Romans used different letters to represent numbers. In the Roman number system, V is five, and L is 50. C is 100, which comes from the Latin word "centum" for 100. The letter D is 500, and M is 1,000. Lower numbers are added to higher numbers when they follow them in a sequence. For example, VIII means the number eight.

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Who invented trigonometry?

Some scholars attributed the invention of trigonometry to Hipparchus. He was the first to formulate a table of chords. A "chord" in ancient Greece was used as a trigonometric function and applied in astronomy. By manipulating the chords on his table, Hipparchus was able to calculate the movement of the zodiac signs. Meanwhile, Menelaus was the first to introduce the spherical triangle along with some trigonometric ratios. Most historians believed that Ptolomy made no original contributions, rather he compiled the works of previous Greek astronomers and published them.

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What is rate of change?

The rate of change can be calculated by taking the difference between the y coordinates of two points, and dividing it by the difference of the x coordinates of the same two points. For example, for the points (2,80) and (4,160), the slope is equal to 160 minus 80, divided by 4 minus 2. This is equal to 80 divided by 2, or 40.

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What size is the standard crib mattress?

These measurements are of extreme importance to prevent head entrapment and suffocation of infants in the crib. When using a standard crib mattress, there should be no more than 2 3/8 inches between the mattress and crib slats. A standard crib mattress should also be used in a toddler bed. The Consumer Product Safety Improvement Act of 2008 mandated the standard size crib and mattress to prevent death and suffocation hazards and maintain safety for infants and toddlers using cribs.

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