Función cubica

P(t)=t³-18t²+81t

t meses	t años	p(t)
0	0	03-18(0)2+81(0)=0
4	1/3	1/33-18(1/3)2+81(1/3)=25,03
12	1	13-18(1)2+81(1)=64
36	3	33-18(3)2+81(3)=108
	5	53-18(5)2+81(5)=80
	7	73-18(7)2+81(7)=28
	9	93-18(9)2+81(9)=0
	10	103-18(10)2+81(10)=10

Función lineal

P1= 2480j----------------- 10º

P2= 4oj--------------------- 15º

a) Pendiente a= y2-y1/x2-x1

a= 40- 2480/15-10= -2440/5= -488

b) y= a (x-x1)+y1

y=-488(x-10)+2480

y=-488x+4880+2480

y=-488x+7360

c) y=-488(x-15)+40

y=-488x+7320+40

y=-488x+7360