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Kryger [21]
3 years ago
11

PLZ HELP! QUESTIONS ARE BELOW! :D

Mathematics
1 answer:
harkovskaia [24]3 years ago
8 0

Answer:

1) 243 in.²

Step-by-step explanation:

1)

A = 18 in. * 18 in. - 9 in. * 9 in. = 243 in.²

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Is 80 to 20 a 75% decrease
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Step-by-step explanation:

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How do i find the perimeter and area?
Contact [7]

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Pythagorean Theorem: a^2 + b^2 = c^2

(12)^2 + b^2 = (16)^2

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b^2 = 112

b = \sqrt{112}

b = 4\sqrt{7}

total base = 2 x 4\sqrt{7} = 8\sqrt{7}

Second, we can find the area. The formula for the area of a triangle is A = 1/2 x base x height.

A = 1/2 x 8\sqrt{7} x 12

A = 4\sqrt{7} x 12

A = 48\sqrt{7} units^2

Third, we can find the perimeter. The perimeter is the sum of all of the exterior sides.

P = 16 + 16 + 8\sqrt{7}

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Hope this helps!! :)

6 0
3 years ago
Solve (algebraically by any method) 3x to the 2 power +8x - 4= 0
Ratling [72]
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x = <u>-b + √ b² - 4ac</u>
               2a
x = <u>-8 + √ 8² - 4(3)(-4)</u>
                 2(3)
x = <u>-8 + √64 - 48 </u>
               6
x = -<u>8 + √16
</u>           6<u>
</u>x = -<u>8 + 4 </u>      x = <u>-8 - 4</u>
         6                    6<u>
</u>x = <u>-4  </u>            x = <u>-12</u>
      6                       6    
x =<u> -2 </u>             x = -2<u>
</u>      3   <u>
</u>
5 0
3 years ago
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