21. ¿Quéón? 1, 4, 7, 10, 13... I. 4n - 3
II. 3n - 2
III. 2(n+1)-3
IV. 3(n+1)-5 V. 2(n+1)-4+n

A) I, III, V
B) I, II, IV
C) II, III, V
D) II, IV, V

Ayuda es para mañana

yes.. it's proven to be 36.

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  

c.

90.0π cm^2

hope you got it.