PLEASE HELP WITH THIS ASAP!

Approximately 9.18% of the radioactive isotope decays each day.

The given equation for the amount of a radioactive isotope remaining after t days is \(y = a(0.66)^{\frac{t}{4} }\), where y represents the remaining amount in grams, a is the initial amount, and t is the number of days. To find the percent of the isotope that decays each day, we'll first find the daily decay factor.

For a daily decay factor, we'll consider t = 1 day. So, we have:

\(y = a(0.66)^{\frac{t}{4} }\)

Now, let's find the percent decay. To do this, we need to determine the proportion of the isotope that has decayed after one day. We can find this by comparing the remaining isotope amount (y) with the initial amount (a).

Percent decay = \(\frac{a-y}{a}\) × 100

Substitute y with the expression we derived earlier:

Percent decay =\([(a - \frac{a(0.66)^{\frac{1}{4} } }{a}  ]\)× 100

Notice that 'a' can be factored out:

Percent decay = \([1 - (0.66)^{\frac{1}{4} } ]\)] × 100

Calculate the numerical value:

Percent decay ≈ [1 - 0.9082] × 100
Percent decay ≈ 9.18%

Therefore, approximately 9.18% of the radioactive isotope decays each day.

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Your answer: A  −14 × {23 + (−47)} = [−14 × 23] + [−14 × (−47)]  This example demonstrates the distributive property of multiplication over addition for rational numbers, which states that for any rational numbers a, b, and c: a × (b + c) = (a × b) + (a × c).

The correct answer is A: −14 × {23 + (−47)} = [−14 × 23] + [−14 × (−47)]. This is an example of the distributive property of multiplication over addition for rational numbers because we are multiplying −14 by the sum of 23 and −47, and we can distribute the multiplication to each term inside the parentheses by multiplying −14 by 23 and −14 by −47 separately, and then add the two results together. This is the basic definition of the distributive property of multiplication over addition. Option B shows the distributive property of multiplication over subtraction, option C shows the product of multiplication and addition, and option D is not a valid equation.

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The probability that the mean cost for plan amazing will be more than the mean cost for plan best is 0.764.

To find the probability that the mean cost for plan amazing will be more than the mean cost for plan best, we need to compare the two sample means.
First, we need to find the standard error of the difference between two means, which is the standard deviation of the sampling distribution of the difference between two means.
The formula for the standard error of the difference between two means is:
SE = sqrt((s1^2/n1) + (s2^2/n2))
Where s1 and s2 are the standard deviations of the two populations, and n1 and n2 are the sample sizes.
Plugging in the values we have:
SE = sqrt((13.58^2/37) + (7.18^2/40)) = 2.76
Next, we need to find the z-score for the difference between the two sample means:
z = (x1 - x2) / SE
Where x1 and x2 are the sample means.
Plugging in the values we have:
z = (39.17 - 41.16) / 2.76 = -0.72
Finally, we can find the probability that the mean cost for plan amazing will be more than the mean cost for plan best by finding the area to the right of the z-score on the standard normal distribution.
Using a standard normal distribution table or calculator, we find that the probability is 0.764.
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Answer:

4/18

Step-by-step explanation:

Answer:

37.5%

Step-by-step explanation:

divide 9 by 24 and you get .375 abd then move 2 decimal places to the left to get a percentage

Answer:

Step-by-step explanation:

I know this is probably wrong but

I think she spends 37.8% of her day at work. 100% is the maximum for percentages. 100/24=about 4.2

9x4.2=37.8

Eric's account balance is $80 (4 parts of $20), since his balance is 4 times greater than Shiloh's balance.

What is Algebraic expression ?

Algebraic expression can be defined as combination of variables and constants.

Since the ratio of Eric’s account balance to Shiloh’s account balance is 4:3, we can represent Eric's balance with 4 equal parts and Shiloh's balance with 3 equal parts.

We know that the total of their accounts is $140, so we can divide the tape diagram into 7 equal parts (4 parts for Eric and 3 parts for Shiloh), each representing $20.

 -------------  -------------

 |   |   |   |  |   |   |   |

 -------------  -------------

$20 $20 $20 $20 $20 $20 $20

Therefore, Eric's account balance is $80 (4 parts of $20), since his balance is 4 times greater than Shiloh's balance.

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Answer:

45 times

Step-by-step explanation:

There are nine pink sections and 11 sections total. The probability of landing on a pink section is 9/11.

Multiply the probability by 55

\(\frac{9}{11}\) × \(\frac{55}{1}\)

Cancel the 11 and 55. The 11 becomes a 1 and 55 becomes a 5

\(\frac{9}{ 1}\) × \(\frac{5}{1}\)

45

Take the average of the three points. Add their coordinates together:

(7, -10) + (-3, 4) + (8, -9) = (7 - 3 + 8, -10 + 4 - 9) = (12, -15)

Divide each coordinate by 3:

(12, -15) / 3 = (4, -5)

The celestial sphere and Earth is the example of a beach ball with a ping pong ball inside of it can be used to imagine the relationship between what two entities.

The heavenly sphere is what Why is this old idea still relevant today?

Which phrase most accurately sums up the celestial sphere?

The entire sky as seen from Earth is portrayed by the celestial sphere. Keep in mind that the celestial sphere is intended to depict the sky as it appears from our planet rather than physical reality.

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An attacker is preparing to perform a protocol-based attack when the target vulnerabilities include headers and payloads of specific application protocols.

A protocol-based attack, also known as a protocol attack, focuses on exploiting vulnerabilities within the headers and payloads of specific application protocols. Application protocols, such as HTTP, FTP, SMTP, or DNS, have their own set of rules and structures for communication. Attackers analyze these protocols and manipulate the headers and payloads to exploit weaknesses and gain unauthorized access or control over a system or network. By understanding the intricacies of the targeted protocols, attackers can craft malicious requests or inject malicious code to exploit vulnerabilities and compromise the targeted system's security. It is crucial for organizations to implement robust security measures and regularly update their systems to protect against protocol-based attacks.

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Positive

Negative

Sorts Explanation

Lines which go / are positive.

Lines which go \ are negative.

That's the best explanation I could do. (Sorry)

Answer:

I'd say about a couple

you're welcome

Answer:

you added 6

Step-by-step explanation:

how the number order goes.

Answer:

difference-of-squares

Step-by-step explanation:

Answer:

Step-by-step explanation:

81 square yards

here u go...........

a) Basis is {[1 0 0;0 0 0;0 0 0], [0 0 0;0 1 0;0 0 0], [0 0 0;0 0 0;0 0 1]} and dimension is 3.  b) Basis is the union of the basis for diagonal matrices and skew-symmetric matrices, which is {[1 0 0;0 0 0;0 0 0], [0 0 0;0 1 0;0 0 0], [0 0 0;0 0 0;0 0 1], [0 1 0;1 0 0;0 0 0], [0 0 1;0 0 0;1 0 0], [0 0 0;0 0 1;0 1 0]} and dimension is 6. c) Basis is {[0 1 0;-1 0 0;0 0 0], [0 0 1;0 0 0;-1 0 0], [0 0 0;0 0 1;0 -1 0], [0 -1 0;1 0 0;0 0 0], [0 0 -1;0 0 1;0 0 0], [0 0 0;0 -1 0;1 0 0]} and dimension is 3.

a) To find a basis for the subspace of all diagonal matrices, we can use the standard basis for 3x3 matrices and select the matrices that have non-zero entries only on the diagonal. Therefore, a basis for this subspace is:

B = {

[1 0 0;

0 0 0;

0 0 0],

[0 0 0;

0 1 0;

0 0 0],

[0 0 0;

0 0 0;

0 0 1]

}

The dimension of this subspace is 3.

b) To find a basis for the subspace of all symmetric matrices, we can use the fact that any symmetric matrix can be written as the sum of a diagonal matrix and a skew-symmetric matrix. Therefore, we can take the basis for the subspace of all diagonal matrices found in part (a) and add to it a basis for the subspace of all skew-symmetric matrices, which we will find in part (c).

c) To find a basis for the subspace of all skew-symmetric matrices, we can use the standard basis for 3x3 matrices and select the matrices that satisfy AT = -A. Therefore, a basis for this subspace is:

B = {

[0 1 0;

-1 0 0;

0 0 0],

[0 0 1;

0 0 0;

-1 0 0],

[0 0 0;

0 0 1;

0 -1 0],

[0 -1 0;

1 0 0;

0 0 0],

[0 0 -1;

0 0 1;

0 0 0],

[0 0 0;

0 -1 0;

1 0 0]

}

The dimension of this subspace is 3.

Therefore, a basis for the subspace of all symmetric matrices can be obtained by taking the union of the basis for the subspace of all diagonal matrices with the basis for the subspace of all skew-symmetric matrices:

B = {

[1 0 0;

0 0 0;

0 0 0],

[0 0 0;

0 1 0;

0 0 0],

[0 0 0;

0 0 0;

0 0 1],

[0 1 0;

1 0 0;

0 0 0],

[0 0 1;

0 0 0;

1 0 0],

[0 0 0;

0 0 1;

0 1 0]

}

The dimension of this subspace is 6.

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the correct answer is B

hope I helped

Use this table,

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Answer:

x ≤ -7

(-∞, -7]

Step-by-step explanation:

         3x + 5

2x - --------------- ≤ -10

             4

1. Multiply 4 on both sides. This eliminates the denominator 4

            3x + 5

(4)2x - --------------- ≤ -10(4)

             4 (4)

2. Combine like terms

8x - (3x + 5) ≤ -40

8x - 3x - 5x ≤ -40

= 5x - 5 ≤ - 40

3. Add 5 on both sides

5x - 5 ≤ -40

     +5      +5

5x ≤ -35

4. Divide

5x ≤ -35

÷5     ÷5

x ≤ -7 or (-∞, -7]

I hope this helps!

Given expression are equivalent.

Yes, When m = 4, the value of expression A is 28 and the value of expression B is 28.

Equivalent expression are those which gives equal answer while putting any value in the given expression.

For example:

1. x + x + x + x and 4x are equivalent expression.

when we put x = 1 both equation become equal to 4.

Here, we have given two expression :

Expression A: 2 ( m + m + m) + m

Expression B: (3+4)m

Now, we can clearly see:

Expression A simplifies to 2(3m) + m = 7m

Expression B simplifies to 7m

Now when we put m = 4

Expression A becomes: 7m = 7 x 4 = 28

Expression B becomes 7m = 7 x 4 = 28

we can clearly see that both the values are equal.

Hence,

Given expression are equivalent.

Yes, When m = 4, the value of expression A is 28 and the value of expression B is 28.

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Answer:

I think that it would be -40

Step-by-step explanation:

I think this because they had to go back 40 spaces because 8 x 5 = 40.

The required number is 40 which represents that player's movements for those 5 turns.

Given that,
Some friends played a board game. During the​ game, one unlucky player had to move back 8 spaces 5 turns in a row.
To determine the number to represent that​ player's movements for those 5 turns.

In mathematics, it deals with numbers of operations according to the statements. There are four major arithmetic operators, addition, subtraction, multiplication and division,

Here,
For every turn, he has back 8 spaces
To the number of spaces back in 5 turns,

Total spaces back = 5 * 8
                           =  40

Thus, the required number is 40 which represents that player's movements for those 5 turns.

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Answer:

f(-6) = -9

Step-by-step explanation:

here, you substitute -6 for x in the function

f(x) = 3x + 9

f(-6) = 3(-6) + 9

f(-6) = -18 + 9

f(-6) = -9

Answer:

额哈哈哈哈哈哈啊啊啊看看我看情况

Step-by-step explanation:

额哈哈哈哈哈哈哈叭叭叭那那那鸡尾酒

Answer:

56

Step-by-step explanation:

Answer:

x = 5

y = 3

Step-by-step explanation:

x + 4y = 17

2x + 5y = 25

We multiply the first equation by -2

-2x - 8y = -34

2x + 5y = 25

-3y = -9

y = 3

Now we put 3 in for y and solve for x

x + 4(3) = 17

x + 12 = 17

x = 5

Let's Check the answer

5 + 4(3) = 17

5 + 12 = 17

17 = 17

So, x = 17 and y = 3 is the correct answer.

The square root of a negative number is not a real number, hence the equation has no real solutions.

To solve the equation log₅(10x - 1) = log₅((9x + 7)x), we can start by using the property of logarithms that states if logₐ(b) = logₐ(c), then b = c.

Step 1: Apply the property of logarithms

10x - 1 = (9x + 7)x

Step 2: Expand the right side of the equation

10x - 1 = 9x² + 7x

Step 3: Rearrange the equation to form a quadratic equation

9x² + 7x - 10x + 1 = 0

9x² - 3x + 1 = 0

Step 4: Solve the quadratic equation

The quadratic equation can be solved using the quadratic formula:

x = (-b ± √(b² - 4ac)) / (2a)

For our equation, a = 9, b = -3, and c = 1. Substituting these values into the quadratic formula, we get:

x = (-(-3) ± √((-3)² - 4× 9 ×1)) / (2×9)

x = (3 ± √(9 - 36)) / 18

x = (3 ± √(-27)) / 18

Since the square root of a negative number is not a real number, the equation has no real solutions.

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The chi-square goodness-of-fit test can provide important information about whether the observed data significantly deviates from the expected distribution, which categories or bins contribute to the deviation, and the overall goodness-of-fit of the data to the expected distribution.

The chi-square goodness-of-fit test is a statistical test used to determine if a sample of data comes from a population with a specific distribution. Specifically, the test compares the observed frequencies of data in different categories or bins with the expected frequencies of data in those categories based on a hypothesized distribution.

It can determine whether the observed data significantly deviates from the expected distribution. If the test results in a p-value less than the chosen level of significance, it indicates that the observed data significantly deviates from the expected distribution, and the null hypothesis (that the data follows the expected distribution) can be rejected.

It can identify which categories or bins contribute the most to any significant deviation. The test statistic and associated p-value can help to identify which categories or bins show significant differences between the observed and expected frequencies.

It can provide information on the overall goodness-of-fit of the data to the expected distribution. The test statistic provides a measure of the overall goodness-of-fit, with higher values indicating greater deviation from the expected distribution.

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Answer:

\( \boxed{ \bold{ \huge{ \boxed{ \sf{n = 1}}}}}\)

Step-by-step explanation:

\( \sf{2 - 4n = 2 - 4(3 - 2n)} \)

Distribute 4 through the parentheses

⇒\( \sf{ 2 - 4n = 2 - 12 + 8n}\)

Move 8n to left hand side and change it's sign

⇒\( \sf{2 - 4n - 8n = 2 - 12}\)

Collect like terms

⇒\( \sf{2 - 12n = 2 - 12}\)

Move 2 to right hand side and change it's sign

⇒\( \sf{ - 12n = 2 - 12 - 2}\)

Calculate

⇒\( \sf{ - 12n = - 12}\)

Divide both sides of the equation by -12

⇒\( \sf{ \frac{ - 12n}{ - 12} = \frac{ - 12}{ - 12} }\)

Calculate

⇒\( \sf{n = 1}\)

Hope I helped!

Best regards!!

Answer:

The expression in simplified form is -13w - 7

Step-by-step explanation:

Given expression is;

-6w + (-8) + 1 + (-7w)

Rearranging the expression and combining alike terms;

-6w + (-7w) + (-8) + 1

-6w - 7w -8 + 1

-13w - 7

The expression in simplified form is -13w - 7

Hence,

The expression in simplified form is -13w - 7

Answer:

Scale is every 1 inch on the blueprint is 2 inches scaled In reality

Step-by-step explanation:

7/3.5=2

so 2 inches for every 1 inche in the scale

Answer:

1:2

Step-by-step explanation:

7/3.5=2

=1:2