A football punted into the air is modeled by the quadratic function y = -16x^2 + 51x + 3 where x is the time in seconds and y is the height of the football in feet. As the football descends, at what time is it at a height of
12 feet?

-18

step-by-step explanation:

because mean value defines that total sum value over total number of set

anser is a

step-by-step explanation:

negitive slope

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

step-by-step explanation:

given   that triangle lno is congruent to triangle lnm.

we have to fill up the blanks in the given question.

according to above order of congruency   kept in mind we can say that

∠lno ≅ ∠lnm

∠oln ≅ ∠mln

ln ≅ ln due to common in both.

hence, by sas congruency,

the side angle side rule   states that if two sides and the included angle of one triangle are congruent to another triangle, then these two triangles are congruent.