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What are some facts about math?

The equals sign was invented in the 16th century by mathematician Robert Recorde because he was tired of writing "equals to." Also, the calculator was derived from the abacus. A number is divisible by 3 if the sum of its digits is divisible by 3. One more fact is that the opposite sides of a die always add up to 7.

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What are the multiples of six?

If a number is a multiple of two and three, then it is also a multiple of six. To find whether or not the number is a multiple of two, check to see if it's an even number. An even number is any number that ends in zero, two, four, six or eight. If the number is even, it's a multiple of two.\nTo check if the number is a multiple of three, add all digits in the number together. If the sum of the digits is divisible by three than the original number is as well.\nThere are similar rules for other numbers. If the last two digits of any number is a multiple of four, then so is the entire n..

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How do you use an online calculator?

A variety of calculators are available. The basic four-function calculator performs the calculations of addition, subtraction, multiplication, and division. Percentages can also be easily calculated. It is also possible to calculate algorithms if you know the formula. If you do not know the formula, a quick search can help you identify the necessary steps. Interest rates, weights and measures and metric conversions can be calculated using special specific calculators, all of which are available for free use online.

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What are some contributions Emmy Noether made to mathematics?

Noether received her Ph.D. in Mathematics in 1908 from the University of Erlangen and began work at the Mathematical Institute of Erlangen the following year until 1915, when she began focusing on Einstein's general relativity theory. Following later teachings in Moscow, Frankfurt and Zurich, Noether was awarded the prestigious Ackermann-Teubner Memorial Prize. In 1933, Noether came to the U.S., where she taught at Bryn Mawr College until her death in 1935.

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How do you do linear regression?

Calculate the mean of both x and yIt is necessary to first find the averages, or means, of both sets of data points. In order to do this, add the value of all the data points under x together, then divide the result by the actual number of data points. The same is done for the y data points.Find the slopeTo find the slope, employ the following equation: m = ((n * sum(x, y)) - (sum(x) * sum(y))) / ((n * sum(x^2)) - (sum(x))^2). N is the actual number of plotted coordinates on the curve.Find the y interceptThe following equation determines the y-intercept: b = y_bar - m * x_bar. M is the calcula..

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How can you make 30 cents with two coins and one not be a nickel?

There are a number of ways to make 30 cents with three or more coins. Three dimes equals 30 cents, and two dimes and two nickels does the trick with four. One dime and four nickels uses a total of five coins, while a quarter and five pennies makes the total with six. The maximum number of U.S. coins used to make 30 cents is that same number of copper pennies.

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How do you use decision tree analysis?

The structure of a decision tree, which is similar to a flow chart, illustrates how one choice leads to the next in the series and shows the relationship between decisions and events. Use of branches in a decision-tree chart show options that cannot occur at the same time. Components of a decision tree include "chance nodes," which are shown as circles. "Decision nodes" are shown as squares, and "end nodes" are shown as triangles on the chart.\nDecision trees are often used in research relating to operations to help uncover strategies most likely to meet particular goals. They are also used in..

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What is the sum of all the positive integer factors of 12?

The factors of a number are the terms that can be multiplied to equal the number. The factors of 10, for example, include 2 and 5, because 2 x 5 = 10. An integer is a whole number, so a positive integer factor of a number is a positive whole number factor. The whole numbers that can be multiplied to equal 12 are 1 x 12, 2 x 6, and 3 x 4. To find the sum, calculate 1 + 2 + 3 + 4 + 6 +12 = 28.

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How many faces does a cone have?

There are a variety of cone types, but all of them only have one face. Cones can be right circular cones or oblique circular cones. Right circular cones are symmetrical with the axis passing through the center of the cone at a 90-degree angle. Oblique circular cones are asymmetrical. Another variety of cone is a truncated cone, which has its apex cut off. An elliptical cone has an ellipsis as its base.

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What is the definition of standard form in math?

The standard form of a linear equation, Ax + By = C, has useful features. It gives an easy way to derive the X and Y intercepts because one can plug in zero for either X or Y to calculate the value of the other variable. This makes it easy to graph the line. The standard form of a quadratic is in the form Ax^2 + Bx + C = 0. This is a useful form because the X value of the vertex of a quadratic is -b/(2a) and the X values of the equations' intersections with the x-axis are (-b +/- sqrt(b^2 - 4ac) ) / (2a).

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