Where is the best place to buy a car? (Like a low price but good car) And why does it have to be so difficult?

I'm crying right now from the stress of it.

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

Could someone me with this question i’ve been stuck on it for 20 minutes

Agroup of three friends order a combo meal which includes two slices of pizza and a drink each drink is priced at $2.50 the combined total of $31.50 how much is the cost of a slice of pizza