Answer:
0.6
Explanation:
If grandpa Erine Shrinks by 2.4cm in 4 years then we would have to divide 2.4cm by 4 in order to get the amount of the change in one year.
4x =2.4cm
divide 4 by both sides of the equation
x= 0.6cm
therefor, 0.6cm is the change in grandpa ernies hight each year.