Urgent what is the vertex of the parabola? assume p > 0.

(0, p)
(0, -p)
(0, 0)
(p, 0)
(-p, 0)

Cam bought some used books for $4.95. he paid $0.50 each for some books and $0.35 each for the others. he bought fewer than 8 books at each price. how many books did cam buy?

Ineed i been stuck on this question since yesterday

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%