Use the information provided to answer Part A and Part B.

During the first month of the year, Beckah bikes 6 miles. Each month after that, she bikes twice as many miles as she biked during the previous month.

Part A
Which equation models how many miles, d, Beckah bikes during the nth month of the year?

d=6+2n

d=6+2(n−1)

d=6⋅2^n

d=6⋅2^n−1

Part B
How many miles did Beckah bike during the fifth month of the year?

14 miles

16 miles

96 miles

192 miles