c. t = 18h
is the appropriate expression for t equals 18 times h.
Answer:
mitochondria and chloroplasts
(i think)
The instruction is right there ! "COMBINE THE LIKE TERMS".
That means ==> add up all the 'n' terms and make a single 'n' term, then ==> add up all the plain numbers to make a single plain number.
Just count up from 9:30. 5 and 1/2 hours is the answer
