Answer with Step-by-step explanation:
Brianna practices the piano 30 minutes per day.
1 hour = 60 minutes
or 1 minute = 1/60 hour
30 minutes = 30/60 hours
= 0.5 hour
i.e. Brianna practices the piano 0.5 hours per day.
a. 0.5 hours per day means
0.5d hours in d days
Expression for the number of hours she practices in d days is: 0.5d
b. Number of hours she practices in 2 days = 0.5×2=1 hour
Number of hours she practices in 4 days = 0.5×4=2 hours
Number of hours she practices in 10 days = 0.5×10=5 hours
