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3 years ago

Multiplii si submultipli Voltului

2 answers:

7 0

MV =MegaVolt   (1 MV = 1000000 V)
KV = KiloVolt   (1 KV = 1000 V)
V = Volt   (1V = 1 V)   :))
mV   = miliVolt (1V = 1000 mV)
μV = microVolt (1V) = 1000000 μV

-Dominant- [34]3 years ago

4 0

Answer:

<h3>Multiples and Submultiples of Volts.</h3>

Multiples and submultiples are prefixes and sufixes which are used to express a higher or lower number of a magnitude.

<h3>From least to greatest.</h3>

Multiples are: deka, hecto, kilo, mega, giga, tera, peta, exa, zetta, yotta.

Submultiples are: deci, centi, mili, micro, nano, pico, femto, atto, zepto, yokto.

Multiples of volts are:

dekavolts: $10V$

hectovolts: $10^{2} V$

kilovolts: $10^{3} V$

megavolts: $10^{6}V$

gigavolts: $10^{9}V$

teravolts: $10^{12}V$

petavolts: $10^{15} V$

exavolts: $10^{18}V$

zettavolts: $10^{21}V$

yottavolts: $10^{24} V$

Submultiples of volts are:

decivolts: $10^{-1}V$

centivolts: $10^{-2}V$

milivolts: $10^{-3} V$

microvolts: $10^{-6}V$

nanovolts: $10^{-9} V$

picovolts: $10^{-12}V$

femtovolts: $10^{-15}V$

attovolts: $10^{-18}V$

zeptovolts: $10^{-21}V$

yoktovolts: $10^{-24}V$ .

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Evaluate the expression. Drag the answer into the box to match the expression. 2^7⋅((3^3)−1)

olga nikolaevna [1]

2^7 * (3³-1) = 128*26=3328. better check the problem again

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3 years ago

Someone please help I don’t understand what this even is.

musickatia [10]

Answer:

A and D are not polynomials. B and C are polynomials

Step-by-step explanation:

In order to find out what function is a polynomial, you have to understand what a polynomial is. A polynomial is a sum of monomials that make up a polynomial expression. A mononomial is a real number, with a variable, and a exponent of a variable that makes up one term. For example $3x^{2}$ is a monomial. It has a real number, a variable, and a exponent that makes up one term. A polynomial has one or more monomial terms that make it a polynomial. So firstly, a polynomial by definition cannot have a negative exponent. That eliminates D. Why? because by definition, the standard form of a polynomial function states that n cannot be positive, it has to be a nonnegative integer. Also, polynomials can only be real numbers. It cannot have a nonreal number. Radical forms without a perfect square are nonreal numbers. So that eliminates A. However, B and C can be polynomials because the definition of polynomials say that real numbers, nonnegative exponents, and constants can be part of a polynomial function. Even with the fraction, that would be part of rational expressions (polynomial/polynomial), which is polynomials. I hope this helps friend. Math can be tough to explain just as much as doing it :)

7 0

3 years ago

The accompanying frequency distribution represents the square footage of a random sample of 500 houses that are owner occupied y

ioda

Answer:

$\bar X = \frac{\sum x_i f_i}{n} = \frac{1220750}{500}=2441.5$

$s^2= \frac{3408029125 -\frac{(1220750)^2}{500}}{500-1} =856849.7$

$s= \sqrt{856849.7}=925.662$

Step-by-step explanation:

For this case we can create the following table

Interval Frequency (f) Midpoint(xi) xi *f xi^2* f

0-499 9 249.5 2245.5 560252.3

500-999 13 749.5 9743.5 7302753

1000-1499 33 1249.5 41233.5 51521258.25

1500-1999 115 1749.5 201193.5 361986278.8

2000-2499 125 2249.5 281187.5 632531281.3

2500-2999 81 2749.5 222709.5 612339770.3

3000-3499 47 3249.5 152726.5 496284761.8

3500-3999 45 3749.5 168727.5 632643761.3

4000-4499 22 4249.5 93489 397281505.5

4500-4999 10 4749.5 47495 225577502.5

Total 500 1220750 3408029125

$\sum f_i = 500 , \sum x_i f_i = 1220750, \sum x^2_i f_i = 3408029125$

For this case we can calculate the sample mean with this formula:

$\bar X = \frac{\sum x_i f_i}{n} = \frac{1220750}{500}=2441.5$

And for the sample variance we can use the following formula:

$s^2= \frac{\sum x^2_i f_i - \frac{(\sum x_i f_i)^2}{n}}{n-1}$

And if we replace we got:

$s^2= \frac{3408029125 -\frac{(1220750)^2}{500}}{500-1} =856849.7$

And the deviation is just the square root of the sample variance and for this case is:

$s= \sqrt{856849.7}=925.662$

4 0

3 years ago

Two cards are drawn without replacement from standard deck of 52 cards. What is the probability that the first card is a spade a

ValentinkaMS [17]

Answer:

13 / 204; No, they are dependent events

Step-by-step explanation:

Total number of cards in the deck = 52

Total number of spades in the deck = 13

Total number of hearts in the deck = 13

Part 1: Calculating the Probability

Picking up the first card:

When picking the first card i.e spade, we have the option to pick 13 cards out of 52. So the probability will be 13/52

When first card is picked, the total number of cards will be reduced to 51 because we are not placing the card back in the deck

Picking up the second card:

When picking up the second card i.e. heart, we have the option to pick 13 cards out of 51. So the probability will be 13/51

The probability of picking a spade and then a heart is = 13/52 x 13/51 = 13/204

Part 2: Independent or Not

Note that, picking up a spade and not replacing it back is changing the probability of picking up a heart. In normal cases, picking up a heart from a deck will have the probability of 13/52, but since the we are not placing the card back the probability is changed to 13/51

Since, the probability of picking a heart is being changed by the previous event, we say that the two events are dependent.

Therefore, the correct answer will be final option: 13 / 204; No, they are dependent events

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3 years ago

Help with math question <br> thanks so much

liubo4ka [24]

I'm not for sure but I think that it would be the first option <span />

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3 years ago