Is the following relation a function? (1 point)

yes
no

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Solve for x: 5/3 x = 20/21 it's fraction. remember to simplify your fraction

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