Question

Sum of two integers is –80. If one of the integers is –90, then find the other.

(ii) Calculate: 1 – 2 + 3 – 4 + 5 – 6 + 7 – 8 + 9 – 10 (show working)
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Answer 1

Answer:

I) 10

Step-by-step explanation:

I) -90+x= -80

x = -80 - (-90)

x = -80+90

x = 10

ii)1+3+5+7+9-2-4-6-8-10

=25-30

=-5