Question #a0622

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Answer 1 · 2017-10-24T13:04:32

#-4#

First, make them have a common denominator, 10. You do this by multiplying both the denominator and the numerator by either 2 or 5.

#-18/10 -30/10 - (-8/10)#

Then subtract #-18/10 -30/10#:

#-18/10 -30/10=-48/10#

Be careful of the sign here; a minus plus a minus makes a plus. This means that:

#-48/10 + 8/10 = -40/10 -> -4#

Answer is #-4#