Will give branliest !
which statement is correctly written as a biconditional statement?
the equation x+3=9 is true when x=6.
if the equation x+3=9 is true, then x=6.
the equation x+3=9 is true if and only if x=6.
the equation x+3=9 is true or x=6.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Data for the height of a model rocket launch in the air over time are shown in the table. darryl predicted that the height of the rocket at 8 seconds would be about 93 meters. did darryl make a good prediction? yes, the data are best modeled by a quadratic function. the value of the function at 8 seconds is about 93 meters. yes, the data are best modeled by a linear function. the first differences are constant, so about 93 meters at 8 seconds is reasonable. no, the data are exponential. a better prediction is 150 meters. no, the data are best modeled by a cubic function. a better prediction is 100 meters.

Using the rise/run counting method, the slope of the line is