Answer:
19.68 cm^2
Step-by-step explanation:
<em>Area of Current Phone </em>
First, find the area of the current phone. We can assume the screen is rectangular. The area of a rectangle can be found using: 
a=l*w 
We know the length is 10.8, and the width is 6.1, so we can substitute them in 
a=10.8*6.1 
a=65.88 
Current Phone: 65.88 cm^2 
<em>Area of New Phone </em>
Find the area of the new phone. 
a=l*w 
We know the length is 12.4, and the width is 6.9, so we can substitute them in 
a=12.4*6.9 
a=85.56 
New Phone: 85.56 cm^2 
<em>Difference </em>
We want to find how much larger the new phone screen is. To do this, find the difference between the new phone area, and the current phone area. 
new phone - current phone 
85.56-65.88 
19.68 
<em><u>The new phone screen is 19.68 cm^2 larger than the current phone screen</u></em>