How many hundreds go into 8 ten thousands

Somone me i want to know what 18 hours out of 24 hours in a fraction

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.

15/16 as a decimal rounded to the nearest hundredth