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Maslowich
3 years ago
15

A pillow that usually costs $18 is marked down 25%. Which expressions can be used to find the new price of the pillow? Check all

that apply.
18 – 0.25(18)
18 – 0.75(18)
0.25(18)
0.75(18)
18(0.25) + 18
Mathematics
2 answers:
user100 [1]3 years ago
6 0

Answer:

a and d

Step-by-step explanation:

brainliest if you want :)

KonstantinChe [14]3 years ago
3 0

Answer:

A or 18 – 0.25(18)

and

D or 0.75(18)

Step-by-step explanation:

Have great rest of your day. I know this works because I got it correct on the assignment. Good luck! :)

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Area of a triangle with points at (-9,5), (6,10), and (2,-10)
Ann [662]
First we are going to draw the triangle using the given coordinates. 
Next, we are going to use the distance formula to find the sides of our triangle.
Distance formula: d= \sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2}

Distance from point A to point B:
d_{AB}= \sqrt{[6-(-9)]^2+(10-5)^2}
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d_{AB}= \sqrt{225+25}
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Distance from point A to point C:
d_{AC}= \sqrt{[2-(-9)]^2+(-10-5)^2}
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d_{AC}= \sqrt{11^2+(-15)^2}
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Distance from point B from point C
d_{BC}= \sqrt{(2-6)^2+(-10-10)^2}
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Now, we are going to find the semi-perimeter of our triangle using the semi-perimeter formula:
s= \frac{AB+AC+BC}{2}
s= \frac{15.81+18.60+20.40}{2}
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Finally, to find the area of our triangle, we are going to use Heron's formula:
A= \sqrt{s(s-AB)(s-AC)(s-BC)}
A=\sqrt{27.41(27.41-15.81)(27.41-18.60)(27.41-20.40)}
A= \sqrt{27.41(11.6)(8.81)(7.01)}
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We can conclude that the perimeter of our triangle is 140.13 square units.

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Answer:

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