Mary Jane Sterling - Algebra I All-in-One For Dummies

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Solve for ‘X’ with this practical and easy guide to everything algebra  A solid understanding of algebra is the key to unlocking other areas of math and science that rely on the concepts and skills that happen in a foundational Algebra class. 
 is the key! With it, you’ll get everything you need to solve the mystery of Algebra I. 
This book proves that algebra is for everyone with straightforward, unit-based instruction, hundreds of examples and practice problems, and two quizzes for every chapter – one in the book and another (totally different!) online. From graph and word problems to the FOIL method and common algebra terminology, 
 walks you step-by-step through ALL the concepts you need to know to slay your Algebra I class. 
In this handy guide, you’ll also: 
Receive instruction and tips on how to handle basic and intermediate algebraic tasks such as factoring and equation simplification Banish math anxiety forever by developing an intuitive understanding of how algebra works Get a handle on graphing problems and functions, as well as inequalities and word problems 
is a must-read for Algebra students looking for an everything-in-one-book supplement to their coursework, as well as anyone hoping to brush up on their math before tackling a related subject, such as physics, chemistry, or a more advanced math topic.

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A.Set up a proportion with words in the two numerators and the corresponding number of minutes in the denominators:

Algebra I AllinOne For Dummies - изображение 734

Divide both numerators by 60 and then cross-multiply to solve for x .

Algebra I AllinOne For Dummies - изображение 735

It will take her 67 minutes — just over an hour.

15 Algebra I AllinOne For Dummies - изображение 736Solve for x : картинка 737

16 Solve for x : картинка 738

17 Solve for x : картинка 739

18 Solve for x : картинка 740

19 A recipe calls for 2 teaspoons of cinnamon and 4 cups of flour. You need to increase the flour to 6 cups. To keep the ingredients proportional, how many teaspoons of cinnamon should you use?

20 A factory produces two faulty tablets for every 500 tablets it produces. How many faulty tablets would you expect to find in a shipment of 1,250?

Finding Common Denominators

Before you can add or subtract fractions, you need to find a common denominator for them. Ideally, that common denominator is the least common multiple (the smallest number that each of the denominators can divide into without a remainder). A method of last resort, though, is to multiply the denominators together. Doing so gives you a number that the denominators divide evenly. You may have to work with larger numbers using this method, but you can always reduce the fractions at the end.

And then, there’s the box method . This method is especially helpful when you have three or more fractions to deal with — and they have relatively large denominators.

Creating common denominators from multiples of factors

Common denominators (the same numbers in the denominators) are necessary for adding, subtracting, and comparing fractions. Carefully selected fractions that are equal to the number 1 are used to create common denominators because multiplying by 1 doesn’t change a number’s value.

Follow these steps to find a common denominator for two fractions and write the equivalent fractions:

1 Find the least common multiple of the two denominators — the smallest number that both denominators divide evenly.First, look to see if you can determine the common multiple by simple observation; you may know some multiples of the two numbers. If you find the common multiple by observation, go directly to Step 4. (Do not pass Go; do not collect $200.)

2 If the common multiple isn’t easily determined, start your search by choosing the larger denominator.Check to see if the smaller denominator divides the larger one evenly. If it does, then you’ve found the common denominator. Go to Step 4.

3 Check consecutive multiples of the larger denominator until you find one that the smaller one divides.That’s your common denominator.

4 When you find a common denominator, rewrite both fractions as equivalent fractions with that denominator.Multiply both numerator and denominator of each fraction by the equivalent of 1 that creates fractions with the common denominator.

Algebra I AllinOne For Dummies - изображение 741 Q.Find the least common denominator for the two fractions картинка 742and картинка 743.

A. 72.Look at the multiples of 24: 24, 48, 72, 96. You can stop with the multiple 72, because that’s also a multiple of 18. The LCD is 72.

Q.How would you write the fractions картинка 744and картинка 745with the same denominator?

A.The fractions картинка 746and картинка 747have denominators with no factors in common, so the least common denominator is 12, the product of the two numbers. Now you can write them both as fractions with a denominator of 12:

Algebra I AllinOne For Dummies - изображение 748

21 Algebra I AllinOne For Dummies - изображение 749Rewrite the fractions картинка 750and картинка 751with a common denominator.

22 Rewrite the fractions картинка 752and картинка 753with a common denominator.

23 Rewrite the fractions картинка 754and картинка 755with a common denominator.

24 Rewrite the fractions картинка 756and картинка 757with a common denominator.

25 Rewrite the fractions картинка 758, картинка 759, and картинка 760with a common denominator.

26 Rewrite the fractions картинка 761, картинка 762, and картинка 763with a common denominator.

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