Algebra I For Dummies®

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In algebra, an improper fraction is one where the numerator (the number on the top of the fraction) has a value greater than or equal to the denominator (the number on the bottom of the fraction) — the fraction is top heavy. If a number is added to the term containing x , you subtract that number from both sides of the equation. Just be sure that whatever you do to one side of the equation, you also do to the other side. Think of the equation as two expressions pivoting on either side of a balance scale: You need to keep the sides at the same weigh t . Quadratic Equations Bobby :The word algebra might make you think of equations and formulas that you only hear about in a maths lesson.

where N is a number between 1 and 10, but not 10 itself, and a is an integer (positive or negative number).

There's no doubt that algebra can be easy to some while extremely challenging to others. If you're vexed by variables, Algebra I For Dummies, 2nd Edition provides the plain-English, easy-to-follow guidance you need to get the right solution every time! Scientific notation is a standard way of writing very large and very small numbers so that they're easier to both compare and use in computations. To write in scientific notation, follow the form

If there’s more than one base in an expression with powers, you can combine the numbers with the same bases, find the values, and then write them all together. For example, If you can do task one in m1 ways, task two in m2 ways, task three in m3 ways, and so on, then you can perform all the tasks in a total of m1 · m2 · m3 . . . ways. When there’s no exponent showing, such as with y, you assume that the exponent is 1, so in the above example, you writeWhether you′re currently enrolled in a high school or college algebra course or are just looking to brush–up your skills, Algebra I For Dummies, 2nd Edition gives you friendly and comprehensible guidance on this often difficult–to–grasp subject. Divisibility by 11:A number is divisible by 11 if the sums of the alternate digits are different by 0, 11, 22, or 33, or any two-digit multiple of 11. In other words, say you have a six-digit number: Add up the first, third, and fifth digits — the odd ones. Then add the digits in the even places — second, fourth, and sixth. Then subtract the smaller of those totals from the larger total, and if the answer is a multiple of 11, the original number is divisible by 11. In this example, you moved the decimal 11 times; also, because you moved the decimal to the left, the exponent is positive. Therefore, a = 11, and so you get