What do radio telescopes use to gather and focus radio waves?

Digital information is stored using a series of ones and zeros. computers are digital machines because they can only read information as on or off –1 or 0. this method of computation is known as the system

Which of these might be an example of an advertiser's target group? a.people who have no access to media b.people the advertisers know nothing about c. people who watch a variety of tv shows d. people who live in the same region of the country

This keeps happening when i try to go to from google or even submit a question