20 points plus !

which function is represented in the table of values?

x 0 -1 -2 -3
y 2 4 8 16

a.
y=2^x
b.
y=2(1/2)
c.
y=-2^x
d.
y=(1/2)^x

Which description is represented by a discrete graph? kiley bought a platter for $19 and several matching bowls that were $8 each. what is the total cost before tax? the temperature at 9 a.m. was 83° f and is heating up at an average rate of 6°f per hour. what is the temperature x hours later? juan ate an egg with 78 calories and some cereal with 110 calories per serving for breakfast. what is the total amount of calories he consumed? a bottle contained 2,000 ml of liquid and is being poured out at an average rate of 300 ml per second. how much liquid is left in the bottle after x seconds?