Question

"karla is taking two classes for a total of six credit hours. therefore she should be spending a minimum of ________ hours for review, homework assignments and preparation for the next class."

Answer 1

This is the concept of algebra, we are required to calculate the total time that Karla should spend in in reviewing, homework assignments and preparation for the next class.
Total number of classes=2
Number of credit hours=6 hours
Time taken for each class=6/2=3 hours
Number of hours for reviewing, homework and assignments should be equal to the amount of time spent in each of the classes. This will give us:
[number of hours]*[activities]
=3*3
=9 hours