Subtract:

7/9-(-13/18)

Convert both denominators to 18 and remember that a negative times a negative is a positive.

I hope this helps. Thanks for asking.

Thank you. Now I know the answer is 1/18, but since the 7/9 is positive and the -13/18 is negative, is the answer negative or positive?

14/18 + 13/18 = 27/18 = 3/2 = 1 1/2

A negative times a negative is POSITIVE !!!!

To subtract fractions, you need to have a common denominator. So, let's find the common denominator for 7/9 and -13/18.

The easiest way to find a common denominator is to multiply the denominators together. In this case, the denominators are 9 and 18.

The next step is to make the denominators the same by multiplying both the numerator and denominator of each fraction by a number that will convert the denominators to the common denominator.

For 7/9, since the common denominator is 18, we need to multiply both the numerator and denominator by 2. So, the equivalent fraction of 7/9 with a denominator of 18 is (7*2)/(9*2) = 14/18.

For -13/18, the denominator is already 18, so we don't need to do anything.

Now, we can subtract the fractions:

14/18 - (-13/18)

To subtract fractions, you subtract the numerators and keep the common denominator:

14/18 + 13/18 = 27/18

However, it is common practice to simplify fractions to their simplest form. In this case, we can simplify 27/18 by dividing both the numerator and denominator by their greatest common divisor (GCD), which is 9.

27/18 divided by 9/9 is 3/2.

So, the simplified result of 7/9 - (-13/18) is 3/2.