A un institut, dos de cada tres alumnes fan servir una mascareta reutilitzable i, tres de
cada cinc prefereixen portar-ne una d’un sol ús.
Quin tipus de mascareta és el més emprat en
aquest institut?

2: 10

step-by-step explanation:

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)