Lesson 1 Polynomials (1) Percent: Percent means parts per 100. The symbol is % used to show percent. So 17% means 17 per 100. A percent can also be expressed as a decimal or fraction Gordon purchased a television when his local electronics store had a sale. The television was offered at 30% off its original price of $472. What was the sale price that Gordon paid? Ratio: A ratio shows the relative sizes of two or more values. Ratios can be shown in different ways. Using the ":" to separate example values, or as a single number by dividing one value by the total. Example: If there are 4 boys and 6 girls write each of the following as a ratio boys to girls _____ girls to people ______ Can these ratios be written in other ways? Explain. Proportion Proportion says that two ratios (or fractions) are equal. Example: 1:3 = 2:6 Practice 1. Rick renovated his home. He made his bedroom 40% larger (length and width) than its original size. If the original dimensions were 144 inches by 168 inches, how big is his room now if measured in feet? 2. Maria paid $28.00 for a jacket that was discounted by 30%. What was the original price of the jacket? 3. Derek received 6 job offers from the 15 interviews he did. Which ratio best describes the relationship between the number of jobs he was not offered and the number of jobs for which he interviewed? Integer: A number that can be written with no fractional component. Includes: The counting numbers {1, 2, 3, …}, zero, and the negative of the counting numbers {1, -2, -3, …} We can write them all down like this: {…, -3, -2, -1, 0, 1, 2, 3, …} Order of Operations: The rules that say which calculations come first in an expression BEDMAS B – Brackets, do all operations in brackets first E – Exponents DM – Divide and Multiply, do them from left to right AS – Add and subtract, do them from left to righ Rational Number: A number that can be written as a fraction. Example: ½, -3/4, 7/2, 1, -80, 1.5 Rules to recall Multiplication To multiply two rational numbers multiply the numerators and denominators separately Division To divide two rational numbers, first flip the second number over (make it a reciprocal) and then do a multiplication Addition and Subtraction Before we add or subtract, the rational numbers should have the same denominator. Then add or subtract the numerators and keep the denominator the same. Collecting Like Terms