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3 years ago

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1/4 of all telephones at the office have built-in speaker phones 1/2 of the phone with the built in speaker phones have conferen

ce call capability how many of the phones in the office have both speakerphone and conference call capability

1 answer:

neonofarm [45]3 years ago

7 0

Answer:

1/8

Step-by-step explanation:

1/2 of 1/4 is 1/8

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Subtract 5x^2-2x-55x 2 −2x−5 from -2x^2-5x-7−2x 2 −5x−7.

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Answer:

7x^2 -128x -19

Step-by-step explanation:

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2 years ago

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Ber [7]

2x + 3 + y = 15 Equation

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3 years ago

Find the length of segment AB

SSSSS [86.1K]

Answer:

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2 years ago

40 points! I just need this one, please help

vesna_86 [32]

Answer:

C. 3,75 cm

Step-by-step explanation:

<u>Ratio of corresponding sides:</u>

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2 years ago

What are the real zeroes of x3 + 6 x2 – 9x - 54?

o-na [289]

Answer:

Option B 3,-3,-6 is correct.

Step-by-step explanation:

We need to find real zeroes of $x^3+6x^2-9x-54$

Solving

$x^3+6x^2-9x-54\\=(x^3+6x^2)+(-9x-54)$

Taking x^2 common from first 2 terms and -9 from last two terms we get

$=(x^3+6x^2)+(-9x-54)\\=x^2(x+6)-9(x+6)\\$

Taking (x+6) common

$(x+6)(x^2-9)\\$

x^2-9 can be solved using formula a^2-b^2 = (a+b)(a-b)

$=(x+6)((x)^2-(3)^2)\\=(x+6)(x+3)(x-3)$

Putting it equal to zero,

$(x+6)(x+3)(x-3) =0\\x+6 =0, x+3=0\,\, and\,\, x-3=0\\x=-6, x=-3\,\, and\,\, x=3$

So, Option B 3,-3,-6 is correct.

7 0

3 years ago