She worked 2 and 1/2 hours yesterday, and today she did 4 and 1/4 hours.
first off, let's check how many hours she worked total, and divide 54 by it.
so, first off, let's convert the mixed fractions to "improper" and add them up.

Answer:
x=?
Step-by-step explanation:
Answer:
2.193 cm³
Step-by-step explanation:
density is mass divided by volume:

you can manipulate the formula by multiplying with volume:

then dividing by density:

in this case:

Answer: check attached
Step-by-step explanation:
All explanation is shown in the attachment.
Goodluck...