Please help me with this is so important

Our goal is to collect email addresses from 60% of customers who purchase a product." so that means if i talk to 95 customers, i need to persuade to provide an email address?

For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =

The amount of data left on the cell phone six gb for 81.5 gb of data is used how much data is available at the beginning of the cycle