F(x)=-x^2+x-5
What are the coordinates of the vertex of the parabola of the function ?

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.

2,10,-50 next two numbers geometric sequence

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.