Hiu
How I can solve this question
To graph the equation between 0 and 5 start with the ordered point (0,100)
You know that in 1 hour the amount will be times the amount at 0 so you get the second ordered pair of (1,400)
Plot the others similarly and draw the graph
Spoiler:
As the graph is exponential growth I suggest using a log scale on the y axis
which gives a straight line in the form
Edit: Plot against to get the straight line, with gradient and y intercept