4students where is scheduled to give book reports in 1 hour. after the first report 2/3 hour remaind. the next two reports took 1/6 hour and 1/4 hour. what fraction of the hour remained?

When adding fractions you need a common denominator so lets look at what "fractions" we are dealing with:2/3 1/6 and 1/4.

First we need to work out how long each report took to write.
First report= 1/3 hour
Second report= 1/6 hour
Third report= 1/4 hour
Then we need to find multiple of 3,4 and 6. Which is 12 because all of these numbers can make 12.
First report= 4/12
Second report= 2/12
Third report=3/12
If we add them all together this makes 9/12.
To find what fraction of an hour is left we take 9/12 away from 12/12.
This equals 3/12 hour.
If your specifically asked to give it in the simplest form you need to find a common factor that can divide the whole fraction down. In this fraction you can choose the number 3. If you divide this down.
Your answer is 1/4 of an hour left.

C. i believe it is (5×(-20))+(100×(0.7))

Idon’t exactly understand but i think dbc=rst