PLEASE HELP QUICK AND EXPLAIN WILL GIVE 75PTS AND BRAINLIEST IF YOU EXPLAIN IT Which of the following tables represents a function?

x 1 −1 4 −4
y 8 8 10 10

x 2 2 3 3
y 6 −6 7 7

x 5 −5 5 −5
y 10 11 12 13

x 2 2 7 7
y 2 3 4 5

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered