Does anyone know the answer to any of these questions?

Tina practice piano for 15 hours last month and 45 hours this month use multiplication to write a statement comparing me i was tina practice during the two months use addition to write a statement comparing the hours tina practice during the two months

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base