Iwill give brainliest
brianna practices the piano 30 minutes per day.
a. write an expression for the number of hours she practices in d days.
b. find the number of hours brianna practices in 2, 4 and 10 days.

Hey!

Part A:

30d (30 * d)

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

Hope This Helped! Good Luck!

what golf ball

step-by-step explanation:

step-by-step explanation:

part a. the differences are decreasing, so we know the sequence is not arithmetic. the ratios are constant (=3/4), so we know the sequence is geometric.

part b. from part a, we know the common ratio is 3/4, so each term is 3/4 of the one before. the initial term is the number of gallons at h=1.

g[h] = (3/4)·g[h-1]

g[1] = 384 . . . . initial value required for a recursive definition

part c. the general formula for a geometric sequence is

a[n] = a[1]·r^(n-1)

we have a[1] = 384, r = 3/4, and the term number given by h. the formula that follows is

g[h] = 384·(3/4)^(h-1)

part d. filling in the value and doing the arithmetic, we have

g[12] = 384·(3/4)^11 ≈ 384·0.042235136 ≈ 16.2183 . . gallons

part e. each gallon is 4 quarts, so

16.2183 gal × 4 qt/gal = 64.8732 qt