step one: change the mixed number into an improper fraction:
1 = 4/4, so 1 3/4 = 4/4 + 3/4 = 7/4
step 2: realize that when we divide by a fraction, we are actually multiplying by the reciprocal, or the opposite of the fraction.
step 3: reciprocate the fraction
we are dividing by 7/4, so the reciprocal is 4/7.
step 4: multiply! to do this, you will just multiply across, meaning you will multiply the numerators together and the denominators together.
(-3/15) * (4/7) = -12/105
step 5: simplify
-12/105 is equal to -4/35
hope this helps!