Which rate is a unit rate?

a. 48 minutes / 4 quarters
b. 40 hours / 5 days
c. 1 week / 7 days
d. 34 miles / 1 gallon

When i'm with my factor 5, my prodect is 20 .when i'm with my addend 6' my sum is 10.what number am i

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

If a and b represent positive real numbers what is the inequality when solves for v