Answer:

Step-by-step explanation:
<em>Angle sum property of triangle states that the sum of interior angles of a triangle is 180°</em>
So,

10% of 80 = 8
80 - 8 = 72
if they are 10% off, the contact lenses will cost $72
So area is base x height:
5(x+2)=20
5x+10=20
5x=10
x=2
its A
Answer:
E. 54cm ^2
Step-by-step explanation:
when finding the area just multiply length over width .for example 9 is the length times it to the width 6 you get 54 so the area will be 54 cm