1 2 3 4 5 6 2 All counting numbers excluding zero
are called
a. Whole Numbers
b. Integers
C. Natural Numbers
d. Rational Numbers

c) natural numbers

Step-by-step explanation:

Natural numbers is the correct answer for this.

Natural numbers are a part of the number system which includes all the positive integers from 1 till infinity and are also used for counting purpose. It does not include zero. they are also called counting numbers.Excluding zero, fractions, decimals and negative numbers.

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step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -