Sara rented a bike from imani’s bikes. it costs $11 plus $4 per hour. if sara paid $43, then he rented the bike for how many hours?

Adriano loves anime and collects toys from his favorite series. each month he gains 4 toys. if adriano has 3 toys when he starts collecting, how many does he have after 4 months

How do i do this activity, is appreciated

If private savings 'v' = 0.75s and total savings 's' equals $4.20 billion, solve for public and private savings.