How many guards do you need for an art gallery with 22 vertices?

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the

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

What multiplys to be 1 but adds up to be 4