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?(1 point) Responses y=(14)x y equals left parenthesis Start Fraction 1 over 4 End Fraction right parenthesis superscript x baseline y=100(0.2)x y equals 100 left parenthesis 0.2 right parenthesis superscript x baseline y=10(2)x y equals 10 left parenthesis 2 right parenthesis superscript x baseline y=15(0.99)x
y=100(0.2)^x
This equation models exponential growth of cells in the petri dish over time.