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irina [24]
3 years ago
5

Each cookie costs $0.75 less than the normal price. Right now if you buy 7 of them it will only cost you $2.80!

Mathematics
1 answer:
sasho [114]3 years ago
4 0

Answer:

$1.15

Step-by-step explanation:

Let the current price of the cookie be C whilst the normal price is c.

From the information we can deduce two equations.

Firstly, since they are $0.75 less than usual:

C+$0.75=c

Secondly, since seven cost $2.80

7C=$2.80

We can simplify this equation by dividng by 7

C=$0.40

Now combine the equations via substitution this value above into the first equation

$0.40 + $0.75= c

c= $1.15

Therefore the normal price is $1.15

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#12 with explanation please
4vir4ik [10]

Answer:

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Step-by-step explanation:

<u>Given vertices WXYZ:</u>

  • W(-4,5), X(2,4), Y(3, -4), Z(-1, -6)

Perimeter is the sum of the side length.

<u>Use distance formula to find each side:</u>

  • WX = \sqrt{(2+4)^2+(4-5)^2} =\sqrt{37} ≈ 6.08
  • XY = \sqrt{(3-2)^2+(-4-4)^2} =\sqrt{65} ≈ 8.06
  • YZ = \sqrt{(-1-3)^2+(-6+4)^2} =\sqrt{20} ≈ 4.47
  • WZ = \sqrt{(-1+4)^2+(-6-5)^2} =\sqrt{130}\sqrt{(-1+4)^2+(-6-5)^2}=\sqrt{130} ≈ 11.40

<u>Find perimeter:</u>

  • P = 6.08 + 8.06 + 4.47 + 11.40 = 30.01 units
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3 years ago
If YC = 4, BC = 6, XY = 5, then AB =
Fittoniya [83]
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Answer:

Step-by-step explanation:

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