Question 894378
The area of a rectangle is 72 centimeters^2.
 What is the value of n if the length is n+9 and the width is .4? 
:
Area is length * width, therefore:
.4(n+9) = 72
.4n + 3.6 = 72
.4n = 72 - 3.6
.4n = 68.4
n = 68.4/.4
n = 171 cm
:
:
See if that checks out
L = 171 + 9 = 180
180 * .4 = 72