Final answer:
Jesse has 9 out of 24 pieces of the puzzle left, which simplifies to 3/8. This fraction converted to a decimal is 0.375.
Step-by-step explanation:
Jesse has put together 15 pieces of a 24 piece puzzle, how much of the puzzle remains to be completed? If 15 pieces are already placed, that leaves 9 pieces out of 24 to be completed. To express this as a fraction in simplest form, we divide both the numerator (9) and the denominator (24) by their greatest common divisor, which is 3. So, we get 9/3 in the numerator and 24/3 in the denominator, resulting in 3/8.
Now, to convert the fraction 3/8 to a decimal, we'd divide 3 by 8 which equals 0.375. In summary, Jesse has 3/8 of the puzzle left to complete, which is equivalent to 0.375 in decimal form.