A scientist is growing cells in a petri dish. Which of the following equations could model the number of cells in the petri dish after x days?
y=(1/4)^x
y=15(0.99)^x
y=10(2)^x
y=100(0.2)^x
The equation that could model the number of cells in the petri dish after x days is:
y = 15(0.99)^x