# Chapter 1 - Section 1.1 - Real Numbers - 1.1 Exercises - Page 10: 1

a. 1 b.-1 c.$\frac{3}{7}$ d.$\pi$

#### Work Step by Step

a. A natural number is a positive integer such as 1, 2, 3, 4, 5, etc. b. An integer is a whole number, or a number that is not a fraction such as 1 or -1. -1 is a correct answer because it is an integer but it is not a natural number, because it is negative. c. A rational number is a number that can be expressed as a fraction. $\frac{3}{7}$ is a correct answer because it is a fraction, and it is not a whole number so it is not an integer. d. An irrational number is a number that cannot be represented in a ratio of two integers. $\pi$ is an irrational number because it cannot be represented in a ratio of two integers.

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