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Across 4. Amount added to the base cost of a product or service 8. Line in an up-down direction or position. Upright. 10. Ratio of two measurements that have different units (like miles and hours, or dollars and ounces). 15. Line-Going side-to-side, like the horizon 16. Points where two or more line segments meet, a corner. 17. Either a single number or variable, or numbers and variables multiplied together and separated by + or – signs 18. How much of something per 1 unit of something else. 19. The starting point. On a number line and graph it is 0 20. Where the graph crosses the y-axis

Down 1. When quantities have the same relative size. In other words, they have the same ratio 2. A value we can put in place of a variable (such as x) that makes the equation true. 3. shows the relative sizes of two or more values. 5. A symbol like x or V that stands in for a number we don't know yet. The unknown. 6. "Expanded Form" (such as 125 = 100+20+5) 7. A number used to multiply a variable. 9. Numbers, symbols and operators (such as + and ×) grouped together that show the value of something. 11. A statement that states two things are equal “this equals that” 12. Where the graph crosses the x-axis 13. A reduction in price 14. Parts per 100