Trapezoid W′X′Y′Z′ is the image of trapezoid WXYZ under a dilation through point C.
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Average rate is given by,
for section A, a=1, b=3
hope this helps.
The cost is the cost per pound times the number of pounds minus the coupon.
If pounds are purchased, she will pay
.
If 3 pounds are purchased, she will pay 3.50(3)-3.25=7.25.