Simplify the expression -7/9 - 5/10

Answers:

1. -7/9
2. -23/18
3. 12/19
4. 23/18

We can sum two fractions if they have the same denominator, so we have to rewrite both fractions so that they'll have the same denominator.

We can generate equivalent fractions by multiplying both numerator and denominator by the same number.

So, we have

Similarly, we have

Now we can sum the fractions:

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation:

70 years.

step-by-step explanation: