Abottle of cranberry juice contains 32 fluid ounces and cost $2.56 what is the unit rate

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

Sorry guys but as you have a small brain

Identify the initial amount a and the growth factor b in the exponential function. a(x)=680*4.3^x