Answer:

Step-by-step explanation:

The least number of books that could be in the box is 30. The number of books in the box could be any number that is a multiple of 30.
Answer:
Missing measure is 79º
Step-by-step explanation:
180-101
He used an incorrect time ratio converting hours to minutes.
Y = 54.
This is really complicated to explain, but since x is 36 and the angle on the other side of the known angle is also 36, that makes y 54. Each pair of angles has to equal to 90 degrees.
Hope this helps!