Answer:
Improper fraction (-81t/ 4s)
Mixed number (-20 1/4) (t/s)
Explanation:
Multiply the numerators
9(9t) = 81t
Multiply the denominators
4s* (-1) = -4s
Put the numerator over the denominator
81t / -4s
If they want the answer as an improper fraction -81t/4s
If they want a mixed number
81/4 = 20 with 1 left over
20 1/4
Then multiply by (-t/w)
(-20 1/4) (t/s)