Answer: Hours by Tina practiced this month is 3 times the hours she practiced last month such that 15 x 3 =45 hours.
Step-by-step explanation:
Given : Duration of Tina practiced piano last month= 15 hours
Duration of Tina practiced piano this month= 45 hours
We can see 45 is a multiple of 15 such that 
Therefore, Hours by Tina practiced this month is 3 times the hours she practiced last month such that 15 x 3= 45 hours.
Answer:

Step-by-step explanation:
6 is the whole number, while 2 is the numerator and 5 is the denominator.
$849-20%=$679
$679+6%(sales tax)=$719
$719 is the total cost of the tv
I think its B I`m not sure