Respuesta :

the answer for w(4)=3x+7 is a)19
AL2006

If w(x)=3x+7 , then w(cow)=3cows+7 ,  and  w(mouse)=3mice+7  and  w(4)=3fours +7.

This last one is the one you have to work with.

w(4) = 3 fours + 7

w(4) = 3(4) + 7

w(4) = (12) + 7

w(4) = 19