Which of the tables represents a function?

table a

input

output

4 3
3 2
2 1

table b

input

output

1 3
3 5
3 7

table c

input

output

0 0
1 4
1 5

table d

input

output

4 1
4 2
4 3

table a

table b

table c

table d

Someone answer asap for ! the boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a. e = 2b - 212 b. b = 2e - 212 c. e = -2b + 212 d. b = -2e + 212

Heather is writing a quadratic function that represents a parabola that touches but does not cross the x-axis at x = -6. which function could heather be writing? fx) = x2 + 36x + 12 = x2 - 36x - 12 f(x) = -x + 12x + 36 f(x) = -x? - 12x - 36

X+y=-4 x-y=2 use elimination with adding and subtraction