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3 years ago

What is x for these two?

Mathematics

1 answer:

djverab [1.8K]3 years ago

6 0

Answer:

a)x=-10, b)x=7

Step-by-step explanation:

a)2x+6= x-4

x=-6-4= 10

b) 20x-18x= +8+6

2x/2=14/2= 7=x

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Step-by-step explanation:

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An equilateral triangle has a perimeter of 48 cm. What is the area?

KiRa [710]

Answer:

$A=64\sqrt{3}\ cm^2$

Step-by-step explanation:

we know that

An equilateral triangle has three equal sides and three equal interior angles (each interior angle measure 60 degrees)

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$P=3b$

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b is the length side of the equilateral triangle

we have

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substitute

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solve for b

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The formula of area applying the law of sines is equal to

$A=\frac{1}{2}b^2sin(60^o)$

substitute the value of b

$A=\frac{1}{2}(16)^2sin(60^o)$

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$A=\frac{1}{2}(16)^2(\frac{\sqrt{3}}{2})$

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