# Elementi di algebra lineare e geometria by Abeasis Silvana By Abeasis Silvana

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2. Write over one hundred. 3. Reduce if necessary. Example 25a (Applying method 1): Change to fractions. Method 2 1. Drop the percent sign. 2. Multiply by . 3. Reduce if necessary. Example 25b (Applying method 2): Change to fractions. 33 34 CliffsNotes Algebra I Quick Review Memorizing the following can eliminate computations: Finding the percent of a number To determine the percent of a number, change the percent to a fraction or decimal (whichever is easier for you) and multiply. Remember, the word of means multiply.

Chapter 2: Signed Numbers, Fractions, and Percents 37 Example 28c: What number is 30% of 50? Therefore, 15 is 30% of 50. Scientific Notation Very large or very small numbers are sometimes written inscientific notation. A number written in scientific notation is a decimal number between 1 and 10 multiplied by a power of 10. Example 29: Express the following in scientific notation. 1 × 10 6. Simply place the decimal point to get a number between 1 and 10 and then count the digits to the right of the decimal to get the power of 10.

50 CliffsNotes Algebra I Quick Review Multiply each side of the equation by (same as dividing by ). Example 5: Solve for x. 5x = 2x – 6 Subtract 2x from each side of the equation. Divide each side of the equation by 3. Example 6: Solve for x. 6x + 3 = 4x + 5 Subtract 4x from each side of the equation. Subtract 3 from each side of the equation. Chapter 4: Equations, Ratios, and Proportions 51 Divide each side of the equation by 2. Literal equations Literal equations have no numbers, only symbols (letters).