Express 0.15 in scientific notation

Pick the description of a geometric object that best matches the real world object box for a deck of card

Find the solution on the interval [0, 2pi)

Can you me with this question? i'll reward *30 points i just need with this one question so that i could solve the others. * edit: i originally set up the question to reward 30 points, but for some reason i can only reward 15. if you don't get 30, then i'm sorry. i'm still kind of new to this site