Answer:
5.5 cm
Step-by-step explanation:
x - 4
4 less than x means that we subtract 4 from x.
Step-by-step explanation:
4x=3×8
4x=24
x=24÷4
x=6
Area = width * height
since the window is 20 inches higher than the width:
width +20 = height
640 = width * width+20
640 = width^2 +20*width
width^2 +20*width - 640 = 0
width = 17.203
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Double Check
if width = 17.203 then height = 37.203
area = 17.203 * 37.203 = 640 square inches Correct!!
