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2 years ago

A. Cual De Las Siguientes Medidas No Se Debería Escribir En Notación Científica:

Mathematics

1 answer:

Mice21 [21]2 years ago

6 0

Answer:

Scientific notation is used to express large numbers into a smaller expression without losing important aspects of the number and its representation. Examples of large numbers are: the number of stars in a galaxy, the numbers of grain sands on a beach, the popoulation of a country.

However, the speed of a car doesn't need scientific notation, beacuse it can't be a large number.

Therefore, the right asnwer here is "Velocidad de un Carro".

The given number is $0.9 \times 10^{-5}$ .

This number is not correct, because, according to the rules of scientific notations, the coefficient of the power must be from 1 to 9, and here we have 0.9, which is out of such interval.

If we use an exponent between 0 and 1, the ten power would decrease. But, if we use exponents greater than 1, that means the ten power will increase. That's the difference between.

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A new medical test has been designed to detect the presence of the mysterious Brainlesserian disease. Among those who have the d

Sergio [31]

Solution :

It is given that :

P (positive | Has disease) = 0.7

P (positive | No disease) = 0.08

P (has disease) = 0.18

P (No disease) = 1 - 0.18

= 0.82

Now if test administered to the individual is positive, the probability that the person actually have the disease is

P (Has disease | positive) $=\frac{P(\text{positive}| \text{has positive}) \times P(\text{Has disease})}{P(\text{positive})}$ ......(1)

The P(positive) is,

$P(\text{positive}) = P(\text{positive} \cap \text{Has disease})+P(\text{positive} \cap \text{No disease})$

= P(positive | has disease) x P(Has disease) + P(positive | no disease) x P(No disease)

= 0.7 (0.19) + 0.04 (0.81)

= 0.1654

Now substituting the values in the equation (1), we get

P (Has disease | positive) $=\frac{P(\text{positive}| \text{has positive}) \times P(\text{Has disease})}{P(\text{positive})}$

$=\frac{0.7(0.19)}{0.1654}$

= 0.8041

5 0

2 years ago

The question is in the picture.

Ghella [55]

Answer:

42 = (3 +x)(4 +x)

Step-by-step explanation:

The only equation that has the existing dimensions <em>increased</em> by x is the first one.

7 0

2 years ago

Suppose that prior to conducting a coin-flipping experiment, we suspect that the coin is fair. How many times would we have to f

STALIN [3.7K]

Answer: b) 84

Step-by-step explanation:

Let p be the prior estimate of the required proportion.

As per given , we have

p =0.5 (The probability of getting heads on a fair coin is 0.5)

Significance level : $\alpha: 1-0.90=0.10\\$

Critical z-value (using z-value table ) : $z_{\alpha/2}=1.645$

Confidence interval width : w= 0.18

Thus , the margin of error : $E=\dfrac{w}{2}=0.09$

Formula to find the sample size ( if prior estimate of proportion is known.):-

$n=p(1-p)(\dfrac{z_{\alpha/2}}{E})^2$

Substitute the values , we get

$n=0.5(1-0.5)(\dfrac{1.645}{0.09})^2$

Simplify ,

$n=83.5192901235\approx84$ [Round of to the next whole number.]

Hence, the number of times we would have to flip the coin =<u>84</u>

hence, the correct answer is b) 84

8 0

3 years ago

Consider the following graph of two functions,S(1) + 8(2)Step 1 of 2: Finds (1) + 8(2)Enable Zoom/Pan8(x) = x2 - 2x - 1S(x) = -x

kumpel [21]

.Given:

$\begin{gathered} f(x)=-x+1 \\ g(x)=x^2-2x-1 \end{gathered}$

ToDetermine: The value of

$f(1)+g(2)$

Solution

$\begin{gathered} f(x)=-x+1 \\ f(1)=-1+1 \\ f(1)=0 \end{gathered}$ $\begin{gathered} g(x)=x^2-2x-1 \\ g(2)=(2)^2-2(2)-1 \\ g(2)=4-4-1 \\ g(2)=-1 \\ f(1)+g(2)=0+(-1) \\ f(1)+g(2)=-1 \end{gathered}$

Hence, f(1) + g(2) = -1

3 0

1 year ago

HELPPPPP PLEWSE POINT SLOPE FORMULA

Sergio039 [100]

Answer:

y = -3/4(x+4)

Step-by-step explanation:

The point slope formula is given by

y-y1 = m(x-x1)

where m is the slope and (x1,y1) is a point on the line

y-0 = -3/4(x - -4)

y = -3/4(x+4)

7 0

3 years ago

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