Answer
See the graphs below, with the increasing c values, the function rises faster, see more explanations below.
Work Step by Step
1. We first draw graphs of $y=c\cdot 2^x$ with $c= 0.25, 0.5, 1, 2, 4$ as shown in
the figure with a series of curves.
2. We compare these curves and find that with the increasing $c$ values, the functions
grow with increasing rate, which means that $y=4\cdot 2^x$ rises much faster than
$y=0.25\cdot 2^x$ as can be seen from the figure.