Sofia is taking a family vacation and wants to download some movies to her smart phone. Her phone has a storage capacity of 16 gigabytes for movie downloads. Last week she used 3.5 gigabytes to download two movies. Which equation can be used to find the number of gigabytes, g, that Sofie has available on her phone to download movies for the vacation? 3.5g = 16

16/3.5 = g

g-3.5=16

g + 3.5 = 16