Evaluate each expression.
Remember to line up the decimal points when adding or subtracting numbers with decimals.
When you subtract a negative, you add its opposite.
Find a common denominator.
See part (b).
Multiply the numerators together and the denominators together.
When you multiply numbers with decimals, you do not need to line up the decimal points.
Remember, a negative number multiplied by a positive number is always a negative number.