You were billed $28.50 for additional data usage on your cell phone at a rate of $9 per gigabyte. three choices are correct ways to calculate the additional gigabytes, g, that you used. which choice is not?

a.) 9g = 28.5
b.) 9/g = 28.5
c.) 28.5 = 9 x g
d.) 28.5/9 = g

will give brainliest if correct ♥

Students are getting signatures for a petition to increase sports activities at the community center. the number of signatures they get each day is 3 times as many as the day before. the expression 3^6 represents the number of signatures they got on the sixth day. how many signatures did they get on the first day?