If if sheila continues riding at her rate for the first day then the expression 100 =+ 12.5t = 100 gives the total distanceas that she has traveled agfter riding for t hours on the second day . evluate this expression when t = 7

If if sheila continues riding at her rate for the first day then the expression 100 =+ 12.5t = 100 gives the total distanceas that she has traveled agfterriding for t hours on the second day . evluate this expression when t = 7 

So, the equation says 12.5t = 100. When t=7, then that would be
= 12.5 * t 
= 12.5 * 7
87.5 gives her a total distance given that time is equal to 7 hours.