If the probability of an event not happening is 57
80
57
80
, what is the probability of the event happening?
Write your answer as a simplified fraction.

step-by-step explanation:

we have

using a graphing tool

see the attached figure

this is a quadratic equation (vertical parabola) open up

the vertex is a > vertex

the domain of the function is all real > interval (-∞,∞)

the range of the function is the > [-6.125,∞)

the function has two x->   and

the function is increasing over the > (0.25,∞)

the function is decreasing over the > (-∞,0.25)

the answer is b.6

step-by-step explanation:

use a calculator or a graph