Question 127189
Part a is correct.


You want option 1 to be less than option 2, so {{{4x+35<6.5x}}}


Solve:
{{{4x-6.5x<-35}}}
{{{-2.5x<-35}}}


Remember when multiplying or dividing by a negative you must reverse the sense of the inequality.
{{{x>35/2.5}}}
{{{x>14}}}


So, as long as you play tennis more than 14 hours per month, option 1 is less costly.