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Homework Help: Math: Algebra: Number Domains
When replacing a variable in an algebraic equation, all of the possible numbers that may substitute that variable are known to have their own domains. For example, the formula to get the area of a rectangle is l*h=V where l is the length, h is the height, and V is the volume. A domain set for h is all the positive real numbers that exist. Positive real numbers, as you will soon discover, are any positive numbers, or any numbers greater than zero. h couldn't be zero or any number less than zero because you can't have a rectangle that has no height, or a negative height. Here are a few other domain names, a brief description of each, and a few examples.
| domain name |
description |
examples |
| natural numbers |
counting numbers |
1, 2, 3, 4, ... |
| whole numbers |
no decimal point needed for these |
0, 1, 2, 3, 4, ... |
| integers |
no decimal point needed for these |
0, -1, 1, -2, 2, ... |
| rational numbers |
can be represented by a fraction |
2/2, 4, -5/6, ... |
| real numbers |
any number in you could possibly think of |
pie, 0, -1, 7, ... |
| positive real numbers |
any positive number you could possibly think of |
3.45, 5.67, 100, ... |
Homework Help: Math: Algebra
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