Which of the following tables represents a function?

x 3 3 4 4
y 2 −2 3 −3

x 5 −5 5 −5
y 2 2 8 8

x 3 3 5 5
y 4 5 6 7

x 4 −4 5 −5
y 2 2 3 3

Mexico city, mexico, is the world's second largest metropolis and is also one of its fastest-growing cities with a projected growth rate of 3.2% per year. its population in 1991 was 20,899,000 people. use the formula p = 20.899e0.032t to predict its population p in millions with t equal to the number of years after 1991. what is the predicted population to the nearest thousand of mexico city for the year 2010?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

Alex measured the length of an item to be 3.7 cm. the actual length is 3.5 cm. what is alex’s percent error?