Mary is buying several items that cost $128.25 total. She is using a store coupon for 35% off her purchases. She has to pay 4% s
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The ratio A/r² would represent 
which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle isr² and if you divided that by the radius squared, you are given pi which is the circumference of a circle divided by its diameter.
You can see this because the area of a circle is
Use Pythagorean theorem:
9i-j = sqrt (9^2 - 1^2) = sqrt(81-1) = sqrt80
now divide both terms in V by that:
u = 9/sqrt(80)i - 1/sqrt(80)j
see attached picture:
9i-j = sqrt (9^2 - 1^2) = sqrt(81-1) = sqrt80
now divide both terms in V by that:
u = 9/sqrt(80)i - 1/sqrt(80)j
see attached picture:
