Question

If a= 21 and b= 18, calculate a-(-b)

Answer 1

Answer:

39

Step-by-step explanation:

a-(-b)

a + b

21 + 18

39

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Answer 2

Step-by-step explanation:

$a = 21 \: and \: b = 18 \: then \: \\ \\ \\ a - ( - b) = 21 - ( - 18) = \\ 21 + 18 = 39$