Find the missing side

Is a deceasing linear model or an exponential decay model likely to be a better fit for the data about remembering? ?

Which is the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?