Final answer:
To find the difference between 3/5 and 9/8 expressed as a decimal, subtract 9/8 from 3/5. The difference is -0.525.
Step-by-step explanation:
To find the difference between two fractions expressed as decimals, you need to subtract the second fraction from the first. So, for 3/5 - 9/8, you would first find a common denominator, which in this case is 40. Then, you would multiply the numerators by the same amount needed to make the denominators equal. This gives you 24/40 - 45/40, which is equivalent to 0.6 - 1.125. Subtracting the decimals gives you the difference of -0.525.
Learn more about finding the difference between fractions