How do I get the answer to this equation

2(10^3/(sqrt400)) -(163-156) ^2 + 10

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?

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

What is the solution to the system of equation graphed belowa.(0,-4)b.(2,5),1),-3)