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3 years ago

Which number is closest to the CUBE ROOT of -205? * -5.1 -5.5 o 5.9 -6.1

Mathematics

2 answers:

Alinara [238K]3 years ago

8 0

Answer:

-5.5

Step-by-step explanation:

astraxan [27]3 years ago

4 0

Answer:

-5. 9

Step-by-step explanation:

$\sqrt[3]{ - 205} = - 5.8963...... = approximately - 5.9$

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Which always yields a cross section that is the same shape and size as the base of the figure?

Ugo [173]

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3 years ago

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What two numbers multiply to 54 and add up to 7

k0ka [10]

Xy = 54
x + y = 7

$xy = 54$
$\frac{xy}{x} = \frac{54}{x}$
$y = \frac{54}{x}$

$x + y = 7$
$x + \frac{54}{x} = 7$
$\frac{x^{2}}{x} + \frac{54}{x} = 7$
$\frac{x^{2} + 54}{x} = 7$
$x^{2} + 54 = 7x$
$x^{2} - 7x + 54 = 0$
$x = \frac{-(-7) \± \sqrt{(-7)^{2} - 4(1)(54)}}{2(1)}$
$x = \frac{7 \± \sqrt{49 - 216}}{2}$
$x = \frac{7 \± \sqrt{-167}}{2}$
$x = \frac{7 \± i\sqrt{167}}{2}$
$x = \frac{7 \± 12.9i}{2}$
$x = 3.5 \± 6.45i$
$x = 3.5 + 6.45i$ $or$ $3.5 - 6.45i$

x + y = 7
3.5 + 6.45i + y = 7
- (3.5 + 6.45i) - (3.5 + 6.45i)
y = 3.5 - 6.45i
  (x, y) = (3.5 + 6.45i, (3.5 - 6.45i)

  or

  x + y = 7
3.5 - 6.45i + y = 7
- (3.5 - 6.45i)   - (3.5 - 6.45i)
y = 3.5 + 6.45i
(x, y) = (3.5 - 6.45i, 3.5 + 6.45i)

The two numbers that add up to 7 and can multiply to 54 is 3.5 ± 6.45i.

5 0

3 years ago

-2(8w+13)+9w=-61 what does w represent

zaharov [31]

-16w-26+9w=-61
-16w+9w=-61+26
-7w=-35
w=5

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3 years ago

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andreyandreev [35.5K]

Answer:

The crayon is about 3 times longer than the paper clip.

The nearest inch: is 3

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The nearest 1/4 inch, 3 1/4

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3 years ago

A pharmacist needs 500 milliliters of a 20% phenobarbital solution but has only 5% and 25% phenobarbital solutions available. Fi

sladkih [1.3K]

Let x be ml of 5% soln.

let 500-x be ml of 25% soln.

x*.05=.05x

(500-x)*.25=125-.25x

500*.20=100

.05x+125-.25x=100

-.2x=-25

x=-25/-.2

x=125 ml of 5% soln.

500-x=375 ml of 25% soln.

Check:

125*.05= 6.25

375*.25=93.75

---------------

========100

7 0

2 years ago