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3 years ago

10

A certain coin is a circle with diameter 18 mm. What is the exact area of either face of the coin? The exact årea of either face

of the coin is mm2. (Simplify your answer. Type an exact answer in terms of re.)

1 answer:

solniwko [45]3 years ago

7 0

I don't understand it sorry

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JulijaS [17]

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4 years ago

Can some one please do this? thank you !

jenyasd209 [6]

Answer:

Step-by-step explanation:

6)a)

$5\sqrt{27}=5\sqrt{3*3*3}\\\\ =5*3\sqrt{3}\\\\ =15\sqrt{3}$

7a) y² - 5y - 14 = y² -7y +2y - 2*7

= y*(y - 7) + 2*(y - 7)

=(y - 7)(y + 2)

b) Use FOIL method

$(2\sqrt{5}+1)(3\sqrt{5}-1)=(2\sqrt{5}*3\sqrt{5})-((2\sqrt{5}*1)+1*3\sqrt{5})-1*1\\\\ =6*5-2\sqrt{5}+3\sqrt{5}-1\\\\ =30+(-2+3)\sqrt{5}-1\\ \\=29+\sqrt{5}$

c) Rationalize the denominator by multiplying the denominator and numerator by √12

$\frac{6}{\sqrt{12}}=\frac{6*\sqrt{12}}{\sqrt{12}*\sqrt{12}}\\\\=\frac{6\sqrt{2*2*3}}{12}\\\\=\frac{6*2\sqrt{3}}{12}\\\\=\frac{12\sqrt{3}}{12}\\\\=\sqrt{3}$

8 0

4 years ago