Question #a0622

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Answer 1 · 2017-10-24T13:04:32

$- 4$ $-4$

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

$- \frac{18}{10} - \frac{30}{10} - (- \frac{8}{10})$ $-18/10 -30/10 - (-8/10)$

Then subtract $- \frac{18}{10} - \frac{30}{10}$ $-18/10 -30/10$ :

$- \frac{18}{10} - \frac{30}{10} = - \frac{48}{10}$ $-18/10 -30/10=-48/10$

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

$- \frac{48}{10} + \frac{8}{10} = - \frac{40}{10} \to - 4$ $-48/10 + 8/10 = -40/10 -> -4$

Answer is $- 4$ $-4$