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What does "PEMDAS" stand for?

When there is not a hierarchy, the operations are performed in order from left to right. For example, in the expression 30 ÷ 5 x 7, division is done first (30 ÷ 5 = 6) and then multiplication follows (6 x 7) for an answer of 42.\nWith several operations, PEMDAS prevents confusion. In the example 8 + 7 x (4+5), the numbers inside the parentheses are addressed first to get 9. Then the multiplication (7 x 9) is performed to obtain 63. Finally, 8 is added for a total of 71.

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What are the factors of 72?

First, all numbers are divisible by themselves and 1. If a number is even, one of the factors is 2, and another is whatever 2 needs to multiply with to get the number. Then, If the sum of the digits (in this case, 7 + 2 = 9) is divisible by 3, one of the factors is 3, and another is whatever 3 needs to be multiplied by to get the number.\nAfter that, try dividing by four. If the product is a whole number, then 4 is one of the factors along with whatever 4 needs to multiply with to get the number. The same process can be followed with the rest of the numbers 5 through 10. If the answer is a who..

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How would you use a number line to round 148 to the nearest 10?

Draw a line centering on your numberA number line is a line on which numbers (usually whole numbers) are labeled. They increase as they go from left to right. Put 148 at the center of your number line.Add numbers before and after your numberMark the line for each new number and write the numbers in sequence before and after 148. For visual clarity, try to keep the space between the marks even. Because you know you're rounding to the nearest multiple of 10, underline the numbers with a zero in the ones' place.Figure out which multiple of 10 is closest to your numberOn the number line ..

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What does "complementary" mean in math?

The term complementary can be used in reference to different aspects of mathematics. With angles, the complement is the addition of two acute angles to equal 90 degrees. In probability, the complement of an event is all outcomes that are not the event itself. For example, when flipping a coin, if the actual event is "heads," then the complement is "tails." In probability mathematics, the combined event and complement make all possible outcomes.

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What is an algebraic expression?

In an algebraic expression, a variable is defined as an alphabetical character. Typically, the first and last few letters of the alphabet are used: a, b and c, or x, y and z. The values of an algebraic expression change depending on the input value of the variable. The operations of an algebraic expression include addition, subtraction, multiplication and division. When an algebraic expression is defined as equaling a number or another algebraic expression, it is then defined as an equation. An example of an algebraic equation is X + 12 = 23, where X is in fact equal to 11.

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Why are graphs useful?

Some studies involve fairly small sample sizes, making it is easy to display data sets written out in a table. Other studies, however, involve large data sets that are cumbersome or even impossible to publish in their entirety. In these cases, graphs provide a way to report data in a concise and meaningful way. Even for small sample sizes, graphs are an excellent means of visualizing data and statistics.\nDifferent types of graphs are useful for different types of research. Bar graphs are good for qualitative data, data that involves frequencies of non-numerical traits and attributes. One bar ..

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What does a million look like in numbers?

One million in dollars is written as either $1 million or $1,000,000. Multiples of millions are written most commonly as 10,000,000 in numbers or 10 million. One million is the equivalent of 1,000 multiplied by 1,000. It is called a cardinal number as opposed to an ordinal number. A cardinal number designates a amount or quantity while an ordinal number designates a position or placement, like first or second.

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How do you calculate acreage from a perimeter?

Determine the area's width, length and radiusUsing the perimeter information, determine the length and width of the selected area. For circular enclosures, divide the circumference by the product of two times pi to derive the radius.Calculate square footageCalculate the total area of the shape. For rectangular areas, calculate the area by multiplying the length of the width by the length of the height. For triangular areas, multiply the width by the height and then divide the product in half. For circles, multiply the square of the radius by pi to calculate the area. The resulting area ca..

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What does intersection mean in math?

The term intersection is defined by some sort of common point or space between two or more entities. An intersection between two data sets is a set of all the common numbers. For example, the intersection of the sets {3,4,5} and {4,5,6} is {4,5}, since 4 and 5 are in both sets.

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What's the difference between a kite and a rhombus?

A kite is one type of four sided figure known as a quadrilateral. As with all quadrilaterals, the sum of its four angles is 360 degrees. The angles of a kite are equal at the points where the two pairs of adjacent sides meet. To calculate the area of a kite, the lengths of its two diagonals are multiplied together and the sum is divided by two.

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