## Precalculus (6th Edition) Blitzer

a. $\sqrt {49}$ b. $0,\sqrt {49}$ c. $-7,0,\sqrt {49}$ d. $-7,-0.\overline6,0,\sqrt {49}$ e. $\sqrt {50}$ f.$-7,-0.\overline6,0,\sqrt {49},\sqrt {50}$
Natural numbers are positive integers Whole numbers and Integers are numbers without fractions or decimals Rational numbers are ones that can be written as fractions in which the numerator and denominator are both integers Irrational numbers are ones that cannot be expressed as a ratio of two integers Real numbers are values that represent any quantity along a number line. $\sqrt 49=7$