Order 0.5 , 0.66 , -1.5 , -1.25 from least to greatest

-1.25, -1.5, 0.5, 0.66

hope it helps you

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value