Alex wrote this equation to represent the total distance she ran in two weeks.

16 = d + 9

which situation could be described by this equation?

a.
alex knows she ran a total of 16 miles. she does not know how many miles she ran the first week. she knows she ran 9 miles the second week.

b.
alex knows she ran 16 miles the first week. she knows she ran 9 miles the second week. she does not know how many miles she ran altogether.

c.
alex knows she ran 16 miles the first week. she knows she ran 9 more miles the second week than the first week. she does not know the total number of miles she ran.

d.
alex knows she ran 16 miles the first week. she knows she ran 9 fewer miles the second week than the first week. she does not know the total number of miles she ran.