Question 734996
The "greater than" sign is the keyboard character of the upper case part of the key with the period symbol; or likely the key two places to the right of the "m" key on the keyboard.  If you want to say, "a" is greater than "b", then type, a>b, and to ensure type rendering enclose the inequality between triple-bracess, which is {{{ on the left and }}} on the right.  These braces are not being displayed.  I'm trying to show } and { but in their proper places.


You are asked to adjust the graph for t>0, t greater than zero, {{{t>0}}}.  This makes sense because the focus is not on garbage produced at a negative time value.  


For simple use of numbers as symbols, you wish to know t when A=200, you can begin with {{{A=7.5*t}}}, let {{{A=200}}}, and solve for {{{t}}}.


{{{A/7.5=t}}}
{{{t=A/7.5}}}
substitute for our given A,
{{{t=200/7.5}}}
{{{t=26&2/3}}} days or maybe 27 days to the nearest day.


As a graph, you are looking for something like this, but it would need to be adjusted to show only for t>0

{{{graph(300,300,0,50,-5,45,7.5*x)}}}

---each graduation mark vertically is five units.