Cait purchases a $20 item at a store. she uses a coupon to receive a 15% discount and she pays 6% on the item. she calculates the total cost, in dollars, of the item using the expression shown.

cait's expression: (1.15)(1.06)(20)

part a: describe the error in the expression cait used for her calculation.

part b: show or explain how you would calculate the total cost of cait's purchase.

A) Cait made two errors:

a discount is a deduction so it should be subtracted from the 100% (1.00 - 0.15 = 0.85), not added to 100% (1.00 + 0.15 = 1.15).she paid 6% of the discounted amount, not 6% in addition to the discounted amount.

B) Original amount × Percent remaining after discount × percent paid

= (20)(0.85)(0.06)

= $1.02

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm

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