Which relation is a function?

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Once george got to know adam, they found that they really liked each other. this is an example of what factor in friendship

Josie buys a pair of boots that retail for $52.00 dollars, however they are currently on sale for 25% off how much does josie pay for the boots if there is also a 6% sales tax on them