Anyone remeber the website that was used in school for math but had a cat on it

Whats three fourths of 15(this is supposed to be in math but i clicked too fast)

How can we take picture in this app

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