Respostas

2014-05-06T16:45:05-03:00
15x+21=90º

15x=90º-21

15x=69

x=69:15

x=4,6
   
2014-05-06T16:55:29-03:00
F(0)=15.0+21
F(0)=0+21=
F(0)=21


F(1)=15.1+21
F(1)=36

Espero ter te ajudado