Homework before the U-4 Exam

Remember:
on Friday 31st of March, 4B ESO and 4A ESO will do their U-4 exam, and on Monday 3rd of April, 4C ESO.

The day of the exam you must hand in your workbooks with pages 27, 28, 29 and 31 done and corrected.

As we didn't finish it in class, here you have the answer key, to check your work.