Please help! can you show work??

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Jabari is power washing houses for a summer job. for every job, he charges an initial fee plus $30 for each hour of work. his total fee for a 4 -hour job, for instance, is $170 . jabari's total fee,f, for a single job is a function of the number,t, of hours it takes him to complete the job. write the function's formula.

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year