PLS HELP ASAP. 60 PTS. SORRY I COULDN’T DO MORE Which is the simplified form of (9c^-9)^-3

A. 9c^27
B. 1/729c^27
C. 729c^27
D. 9/c^27

Also, no random answers pls

Which is the focus of a parabola with equation y2=4x

Ineed big ! the cost of a school banquet is $25 plus $15 for each person attending. create a table, sketch the graph, and write an equation in slope-intercept and point-slope form that gives total cost as a function of the number of people attending. what is the cost for 77 people?

Can someone plz me understand how to do these. plz, show work.in exercises 1-4, rewrite the expression in rational exponent form.[tex]\sqrt[4]{625} \sqrt[3]{512} (\sqrt[5]{4} )³ (\sqrt[4]{15} )^{7}\\ (\sqrt[3]{27} )^{2}[/tex]