Norachai rented a bike from adam's bikes. it cost $17.10 plus $5 per hour. if norachai paid $32.10 then he rented the bike for how many hours?

Will give brainliest summations with algebraic expressions image shown

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia