Question #a0622

1 Answer
Oct 24, 2017

#-4#

Explanation:

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#