Is 721 ft above sea level positive, zero, negative ?

Well it is ABOVE sea level, so its positive.

Sea level would be considered zero, and if it was below sea level it would be considered negative.

I hope this helped you ♥  ♥

it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

step-by-step explanation:

copy and paste, put it in google

(- 1, 0 )

step-by-step explanation:

an x- intercept is where the function crosses the x- axis.

to find the x- intercept/s look for the value of x when f(x) = 0

from the given table there are 3 values of x where f(x) = 0

when x = - 1, x = 2, x = 3

the one that is listed is (- 1, 0 )