Ineed to know the process of this answer

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250