Which of the following numbers is not equivalent to-15/3 A -15/-3

B -15/3

C 15/-3

D -5​

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

The last time i bought this product , it cost $20.00 but it looks like it cost 29. 60 today? what is the increase

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.