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? (9g=28.5) (9g=28.5) ( 28.5=9⋅g) (28.59=g)

28.59=g is incorrect.

Step-by-step explanation:

Hi, to answer this question we have to analyze the information given:

Bill for additional data usage: $28.50

Cost per gigabyte: $9

To calculate the additional gigabytes we have to write an expression where the total bill ($28.5) is equal to the gigabytes used (g) multiplied by the cost per gigabyte.

Mathematically speaking:

28.5 = 9g

The three first options are correct (one is put in a different order but is the same expression). So, the incorrect option is (28.59=g).