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1. A diagram showing the relation between variable quantities, typically of two variables, each measured along one of a pair of axes at right angles.
4. A quantity representing the power to which a given number or expression is to be raised, usually expressed as a raised symbol beside the number or expression.
6. Of or expressed by a mathematical exponent.
8. Not consistent or having a fixed pattern; liable to change.
9. Once a year; every year.
13. The process or skill of multiplying.
15. The action of separating something into parts, or the process of being separated.
19. A numerical quantity that is not a whole number (e.g., 1/2, 0.5).

2. The quantitative relation between two amounts showing the number of times one value contains or is contained within the other.
3. Forming or following in a logical order or sequence.
5. A set of facts or figures systematically displayed, esp. in columns.
7. The branch of mathematics dealing with the relations of the sides and angles of triangles and with the relevant functions of any angles.
9. The action or process of adding something to something else.
10. Having a position on the other or further side of something; facing something, esp. something of the same type.
11. The longest side of a right triangle, opposite the right angle.
12. The process or skill of taking one number or amount away from another.
14. next to or adjoining something else.
16. The trigonometric function that is equal to the ratio of the side opposite a given angle (in a right triangle) to the hypotenuse.
17. Arranged in or extending along a straight or nearly straight line.
18. The process of increasing in physical size.