Question

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Answer 1

Answer:

Step-by-step explanation:

15.

(i) 30 -  (-20) = 30 + 20 = 50

50 is the increase of the no.

(ii)  -30 - 40 = -30-40 = -70

70 is the decrease of the no.

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Answer 2

ANSWER :

1. A number changes from -20 to 30.

here from negative number becomes positive so there is increase in number.

$30 - ( - 20) = + 50$

2. A number changes from 40 to -30.

here from positive number becomes negative so there is decrease in number.

$40 - ( - 30) \\ 70$

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