Question

HELP I WILL GIVE BRAINLIEST

Answer 1

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

Answer 2

Hey!

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Part A:

30d (30 * d)

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Part B:

Using the expression 30d we can solve how much time Brianna spent playing piano.

30(2) = 60 minutes (1 hour) in 2 days

30(4) = 120 minutes (2 hours) in 4 days

30(10) = 300 minutes (5 hours) in 10 days

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Hope This Helped! Good Luck!