Help please
solve for Z and Y

Find the power series expantion of f(z)=log(4=3z) at the point z=-1

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?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?