Let A ∈ R^nxn and let C ∈ R^nxm. Prove the following: (1) Assume A is positive semidefinite. Show that tr A=0 if and only if A = 0. (2) When m

For 420 minutes of calls will the costs of the two plans be equal.

We have,

The first plan has a $21 monthly fee and charges an additional $0.09 for each minute of calls.

The second plan has no monthly fee but charges $0.14 for each minutes.

So, the equation can be set as

0.14x = 0.09x +21

where x be the number of minutes.

0.14x - 0.09x = 21

0.05x = 21

x = 420 minutes

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Answer:

A and C are true

I have a a question i don't know what answer to put on i only have the answer 125

If Patricia needs to have $30,000 for her daughter's college tuition that is due in exactly 2 years, she should invest C. $26, 654.70 (present value) in an account paying 6% interest compounded semi-annually.

The present value describes the current investment needed to earn a future value.

The present value can be determined using the PV formula or an online finance calculator.

N (# of periods) = 4 semi-annual periods (2 years x 2)

I/Y (Interest per year) = 6%

PMT (Periodic Payment) = $0

FV (Future Value) = $30,000

Results:

Present Value (PV) = $26,654.70

Total Interest = $3,345.30

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The missing value so that the relation is still a function is {(3, 7), (0, −2), (1, −3), (−2, 1), (1, 4)} (option b)

In this case, let's first check if the given set is a function without the missing value. We can do this by checking if each input value appears only once in the set. If we look at the set {(3, 7), (0, −2), (−2, 1), (1, 4)}, we can see that each input value appears only once, which means that the set is a function.

Now, we need to determine which value can replace the missing value so that the set remains a function. Let's consider each option one by one.

If we replace the missing input value with 1, we get {(3, 7), (0, −2), (1, −3), (−2, 1), (1, 4)}. Here, we can see that each input value maps to a unique output value, which means that the set is still a function.

Therefore, option B is the correct answer.

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a)

The events X and Y are not independent.

b)

(1)The value of P(B) is 1/124.

(ii) The value of P(A ∩ B') is 9/16.

We have,

a)

We have:

P(X) = 0.6

P(Y) = 0.2

P[(X Y) ∪ (X Y')] = 0.45 (using the distributive property of set operations)

We want to find P(X ∩ Y), which we can do using the formula:

P(X ∩ Y) = P(X) + P(Y) - P(X ∪ Y)

To find P(X ∪ Y), we can use the formula:

P(X ∪ Y) = P(X) + P(Y) - P(X ∩ Y)

Using the values given, we have:

P(X ∪ Y) = 0.6 + 0.2 - P(X ∩ Y) (substituting in P(X) and P(Y))

P[(X Y) ∪ (X Y')] = 0.45 (given)

We can rewrite the left-hand side as:

P[(X Y) ∪ (X Y')] = P(X Y) + P(X Y') (using the distributive property of set operations)

Since X and Y are disjoint events, we have:

P(X Y') = P(X) - P(X ∩ Y) (using the formula for the probability of the complement of an event)

Substituting these values into the expression for P[(X Y) ∪ (X Y')], we get:

P(X Y) + (P(X) - P(X ∩ Y)) = 0.45

Simplifying, we get:

P(X Y) = 0.45 + P(X ∩ Y) - P(X)

Substituting in the values of P(X) and P(Y) given, we get:

P(X Y) = 0.45 + P(X ∩ Y) - 0.6

P(X Y) = -0.15 + P(X ∩ Y)

Since probabilities cannot be negative, we know that P(X Y) ≤ P(X ∩ Y). Therefore, we can conclude that X and Y are not independent.

b)

i. We have:

P(A) = 7/8

P(B) = 1/12

P(A ∩ B) = 5/16

We want to find P(B). We can use the formula:

P(A ∪ B) = P(A) + P(B) - P(A ∩ B)

Since A and B are disjoint events, we have:

P(A ∪ B) = P(A) + P(B)

Substituting in the values given, we get:

P(A) + P(B) = 7/8 + P(B) = 1 - P(B') = 11/12

Solving for P(B), we get:

P(B) = 11/12 - 7/8 = 1/24

ii.

We want to find P(A ∩ B'). We can use the formula:

P(A ∩ B') = P(A) - P(A ∩ B)

Substituting in the values given, we get:

P(A ∩ B') = 7/8 - 5/16 = 9/16

Thus,

a)

X and Y are not independent.

b)

(i) P(B) = 1/124

(ii) P(A ∩ B') = 9/16

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a rhombus is a parallelogram with a pair of opposite equal acute angles, a pair of opposite equal obtuse angles, and four equal sides.

in other words, it is a parallelogram with 4 equal sides, including a square as a special case.

the diagonal intersection point is the midpoint of both diagonals.

the diagonals intersect each other at a right angle (90°).

and they split each vertex angle in half.

so, they split the whole rhombus into 4 equal right-angled triangles.

and remember, the sum of all angles in a triangle is always 180°.

an "obtuse" angle means an angle larger than 90°.

an "acute" angle means an angle smaller than 90°.

because of all that, in the triangle PKE the angle K must be greater than 45° (90/2 = 45), so that the rhombus angle K can be "obtuse", as it must be twice the triangle angle K.

the triangle angle E is 90°.

so, the 16° must be triangle angle P.

and the triangle angle K is then

triangle angle K = 180 - 90 - 16 = 74°.

so, rhombus angle K = rhombus angle N = 2×74 = 148°

and triangle PMN angle N = 74°.

triangle PMN angle M = triangle PMN angle P = 16°.

The key words in the question are "descriptive statistics." "Descriptive" refers to describing or summarizing data, while "statistics" refers to the collection, analysis, and interpretation of data.

This question relates to the topic of statistics.

To solve this question, you need to identify which situation involves the use of descriptive statistics. You can do this by understanding that descriptive statistics involves summarizing or describing data, such as calculating measures of central tendency (like the mean or median) or analyzing the distribution of data.

The correct answer choice is C) A study shows that the average student leaves a four-year college with a student loan debt of more than $30,000. This situation involves the use of descriptive statistics because it describes the average amount of student loan debt for a particular group of people (students who attend four-year colleges).

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Answer:

To draw a right triangle with a tangent ratio of 3/2 for one of the acute angles, we can choose any angle whose tangent is 3/2. Let's choose the angle θ.

We know that:

tangent ratio = opposite side / adjacent side

So, we can assign any value we want to the adjacent side, and then calculate the opposite side. Let's say the adjacent side is 2 units. Then, the opposite side would be:

opposite side = tangent ratio * adjacent side = (3/2) * 2 = 3

So, the sides of the triangle are:

adjacent side = 2

opposite side = 3

hypotenuse = √(2^2 + 3^2) = √13

We can now use trigonometry to find the measure of the other acute angle. The tangent of an angle is equal to the opposite side over the adjacent side, so we have:

tan(θ) = opposite side / adjacent side

tan(θ) = 3/2

Taking the inverse tangent of both sides, we get:

θ = tan^(-1)(3/2)

θ ≈ 56.3°

So, the other acute angle of the right triangle is approximately 56.3 degrees.

To find the first few coefficients in the power series for the function f(x) = x * ln(1+x), we will use the Taylor series expansion. The Taylor series for ln(1+x) is:

ln(1+x) = x - (x^2)/2 + (x^3)/3 - (x^4)/4 + ...

Now, multiply each term by x:

x * ln(1+x) = x^2 - (x^3)/2 + (x^4)/3 - (x^5)/4 + ...

The first few coefficients in the power series are: 0 (constant term), 0 (x term), 1 (x^2 term), -1/2 (x^3 term), 1/3 (x^4 term), and -1/4 (x^5 term).

For the radius of convergence, we'll use the Ratio Test. Observe the absolute value of the ratio of consecutive terms:

lim (n -> infinity) | (a_(n+1)/a_n) | = lim (n -> infinity) | (x^(n+2) * (n+1))/((n+2) * x^(n+1)) |

This simplifies to:

lim (n -> infinity) | x * (n+1)/(n+2) |

To converge, the limit must be less than 1:

|x * (n+1)/(n+2)| < 1

As n approaches infinity, the expression becomes |x|, so:

|x| < 1

Thus, the radius of convergence for the series is 1.

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The standard form of the equation is x² + 6.5x + 10 - y = 0

First, we need to expand the equation

y = 0.5(2x+5)(x+4)

y = 0.5(2x² + 13x + 20)

y = x² + 6.5x + 10

Now, to write this in standard form, we need to move all the terms to one side and set it equal to zero:

y = x² + 6.5x + 10

y - x² - 6.5x - 10 = 0

Hence, the standard form of the equation is x² + 6.5x + 10 - y = 0

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a. The sample mean of the confidence interval is 1086. b. The margin of error is of the confidence interval is 157. c. Out of 1400 confidence intervals, we can expect approximately 1330 to contain the true mean.

a. To find the sample mean, you need to calculate the center of the confidence interval (929, 1243). To do this, add the lower limit and the upper limit, and then divide by 2:
(929 + 1243) / 2 = 2172 / 2 = 1086.
So, the sample mean for the sodium content is 1086 mg.

b. To find the margin of error, subtract the lower limit from the sample mean:
1086 - 929 = 157.
The margin of error is 157 mg.

c. Since you are working with a 95% confidence interval, you would expect 95% of the 1400 confidence intervals to contain the true mean. To calculate the approximate number of good intervals, multiply the total number of samples (1400) by 0.95:
1400 * 0.95 = 1330.
Therefore, you would expect approximately 1330 of the 1400 confidence intervals to contain the true mean.

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The percent of container A that is empty after the pumping is complete is approximately 35.4%.

We have,

The volume of water in container A is given by:

V(A) = πr²h

= π(6 ft)²(7 ft)

= 882π cubic feet

The volume of water in container B is given by:

V(B) = πr²h

= π(5 ft)²(10 ft)

= 250π cubic feet

When container A is emptied into container B, the total volume of water becomes:

= V(A) + V(B)

= 882π + 250π

= 1132π cubic feet

The volume of container B is 250π cubic feet, so the remaining volume of water in container A is:

= 1132π - 250π

= 882π cubic feet

The percent of container A that is empty after the pumping is complete is:

= (882π / (πr²h)) x 100%

= (882 / (6² x 7)) x 100%

= 35.4%

Therefore,

The percent of container A that is empty after the pumping is complete is approximately 35.4%.

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The approximate area of composite figure is 80.01cm2, the correct option is A.

We are given that;

Measurements= 7cm, 10cm and 6cm

Now,

Area of triangle= 1/2 x 7 x 6

=21cm2

Area of semicircle= 3.14*7/2

=10.99cm2

Area of rectangle= 10*7

=70cm2

Area of figure= 21 + 70 - 10.99

=80.01cm2

Therefore, by area the answer will be 80.01cm2.

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To verify if the set {-696, -36, -19, 3, 7, 12, 99} is a complete system of residues modulo 7, we need to check if all residue classes modulo 7 are represented by elements in the set.

The residue classes modulo 7 are {0, 1, 2, 3, 4, 5, 6}. To check if the given set is a complete system of residues modulo 7, we need to check if each residue class is represented by at least one element in the set.
- 0: None of the elements in the set is divisible by 7, so none of them leave a residue of 0 when divided by 7.
- 1: 12 and -696 leave a residue of 1 when divided by 7.
- 2: -36 leaves a residue of 2 when divided by 7.
- 3: 99 and -19 leave a residue of 3 when divided by 7.
- 4: None of the elements in the set leave a residue of 4 when divided by 7.
- 5: 7 leaves a residue of 5 when divided by 7.
- 6: 3 leaves a residue of 6 when divided by 7.
Since every residue class modulo 7 is represented by at least one element in the set, we can conclude that the set {-696, -36, -19, 3, 7, 12, 99} is a complete system of residues modulo 7.

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The value of MAS to the nearest degree, given the radius of the circle, is 103 degrees.

Angle MAS can be found by the formula for calculating arc length which is:

L = ( n π r ) / 180

Further solving will give us:

n π r = 197 x 180 = 3, 546

n = 3, 546 / π r

n = 3, 546 / ( 3.14 x 110 )

n = 103 degrees

In conclusion, angle mAS can be found to be 103 degrees.

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The statement "A single, extremely large value can affect the median more than the mean" is True.

The median is the middle value when the data is arranged in ascending or descending order, and it is less affected by extreme values because it only considers the position of the value, not its actual magnitude.

On the other hand, the mean (average) takes into account the values themselves and can be heavily influenced by outliers. An extremely high or extremely low data value is called an outlier.

Outliers can skew the mean, pulling it towards their extreme value, while the median remains relatively unaffected. So the statement is True.

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The 95% confidence interval for the true proportion of students who work a part-time job is approximately (0.4014, 0.4986), and the margin of error is approximately 0.0486. So, the closest answer among the options provided is 0.049.

To construct a 95% confidence interval for the true proportion of students who work a part-time job and find the margin of error, follow these steps:

1. Determine the sample proportion (p-hat):

Divide the number of students who work a part-time job (180) by the total number of students (400).
p-hat = [tex]\frac{180}{400}=0.45[/tex]

2. Determine the critical value (z) for a 95% confidence interval. Using a z-table, the critical value is approximately 1.96.

3. Calculate the standard error (SE) of the sample proportion:

SE =[tex]\frac{\sqrt{(p-hat)(1-p-hat)}}{n}[/tex] = [tex]\frac{\sqrt{(0.45)(1-0.45)}}{400}[/tex]≈ 0.0248

4. Calculate the margin of error (ME) by multiplying the critical value (z) by the standard error (SE):
ME = 1.96×0.0248 ≈ 0.0486

5. Construct the confidence interval by adding and subtracting the margin of error from the sample proportion:
Lower bound: 0.45 - 0.0486 ≈ 0.4014
Upper bound: 0.45 + 0.0486 ≈ 0.4986

So, the closest answer among the options provided is the fourth option 0.049.

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Answer:

as the dimensions or shape of the parking lot.

15 and 16

Step-by-step explanation:

Answer:

The graph shown is the answer

Step-by-step explanation:

It says why and how its the answer

Answer:

8

Step-by-step explanation:

diameter=radius×2=4×2=8

By employing this comprehensive approach, it is possible to address the Fentanyl epidemic and work towards reducing its devastating impact on individuals and communities

The Fentanyl epidemic refers to the widespread misuse and abuse of Fentanyl, a powerful synthetic opioid painkiller. This opioid is 50 to 100 times more potent than morphine, which makes it highly addictive and prone to overdoses. The epidemic has been exacerbated by the increased availability of illicitly manufactured Fentanyl, leading to a significant increase in overdose deaths and addiction rates.

To end the Fentanyl epidemic, I would suggest the following multi-pronged strategy:

1. Education and awareness: Increase public awareness of the dangers of Fentanyl and its addictive potential through targeted educational campaigns and outreach programs.

2. Monitoring and regulation: Strengthen regulations around prescription and distribution of Fentanyl to reduce over-prescribing and diversion to the illicit market.

3. Access to treatment: Expand access to evidence-based addiction treatment options, including medication-assisted treatment and counseling, to help those struggling with Fentanyl addiction.

4. Law enforcement and interdiction: Improve coordination between law enforcement agencies to better detect and disrupt the supply of illicit Fentanyl and related substances.

5. Harm reduction: Implement harm reduction strategies, such as supervised injection facilities and distribution of naloxone, a medication that can reverse the effects of an opioid overdose, to save lives and reduce the risk of transmission of infectious diseases.

By employing this comprehensive approach, it is possible to address the Fentanyl epidemic and work towards reducing its devastating impact on individuals and communities.

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The  maximum change in GDP resulting from the given policies is a decrease of $545 billion.

To determine the maximum change in GDP resulting from the given policies, we can use the following formula:

ΔGDP = (ΔSpending + ΔInvestment) / (1 - MPC)

where ΔSpending is the change in government spending and ΔInvestment is the change in investment.

In this case, we have:

ΔSpending = -$93 billion (since it is a tax cut)
ΔInvestment = -$16 billion
MPC = 0.8

Substituting these values into the formula, we get:

ΔGDP = (-$93 billion + (-$16 billion)) / (1 - 0.8) = -$109 billion / 0.2 = -$545 billion

Therefore, the maximum change in GDP resulting from the given policies is a decrease of $545 billion.

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Answer: -15

Step-by-step explanation:

x+y=10

y=-x+10

2x+3(-x+10)=45

2x-3x+30=45

-x=15

x=-15

If A and B are independent events with P(A) = 0.4 and P(B) = 0.25, then P(A È B) =The answer is d. 0.55.

Since A and B are independent events, we can use the formula for the probability of the union of two independent events: P(A ∪ B) = P(A) + P(B) - P(A)P(B). Given P(A) = 0.4 and P(B) = 0.25, we can calculate P(A ∪ B) as follows:

P(A ∪ B) = 0.4 + 0.25 - (0.4)(0.25) = 0.4 + 0.25 - 0.10 = 0.55

Or we can calculate as follows:

To find P(A È B), we use the formula: P(A È B) = P(A) + P(B) - P(A and B)

Since A and B are independent, P(A and B) = P(A) x P(B) = 0.4 x 0.25 = 0.1

Therefore, P(A È B) = 0.4 + 0.25 - 0.1 = 0.55.

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The measure of angle B in the given triangle is 56°

From the question, we are to determine the measure of the unknown angle

From the given information,

We have a right triangle and the measure of one of the angles is 34°

The right triangle is ΔABC, and we are to determine the measure of angle B

m ∠A + m ∠B + m ∠C = 180° (Sum of angles in a straight line)

90° + m ∠B + 34° = 180°

m ∠B + 124° = 180°

m ∠B = 180° - 124°

m ∠B = 56°

Hence, the measure of angle B is 56°

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The volume of the cylinder is 12π units³.

Option A is the correct answer.

We have,

The formula for the volume V of a cylinder with radius r and height h is:

V = πr²h

Now,

Radius = 2 units

Height = 3 units

Now,

Volume.

= πr²h

= π x 2 x 2 x 3

= 12π units³

Thus,

The volume of the cylinder is 12π units³.

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The simple interest after 30 months is $924. 375

To determine the simple interest value, we need to know the formula for calculating it

The formula for simple interest is represented as;

S.I =PRT/100

The parameters of the equation are;

From the information given, we have;

Substitute the values

Simple interest = 8500 × 2.5 × 4.35/100

Multiply the values

Simple interest = 92437.5/100

Divide the values

Simple interest = $924. 375

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So, the recursive formula for H(n) is:

H(1) = 2

H(n) = H(n-1) + 12

A recursive formula is one that defines each term in a series by reference to the phrase(s) that came before it. The first term, or firsts, in the series must always be stated in recursive formulae. A recursive algorithm is one that uses "smaller (or simpler)" input values to call itself and gets the result for the current input by performing straightforward operations on the value that was returned for the smaller (or simpler) input.  

And the Fibonacci sequence is the most well-known recursive formula. The following is the Fibonacci sequence: 0, 1, 1, 2, 3, 5, 8, 13, 21,… Keep in mind that each number in the series is the product of the two numbers before it. For instance, the total of the two terms before it, 5 and 8, is 13.

Recursive formula for H(n), we need to find the first term and the common difference.

H(1) = -10 + 12(1) = 2

H(2) = -10 + 12(2) = 14

The common difference between H(1) and H(2) is 14 - 2 = 12.

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Correct Question:

H(n) = -10 + 12n

Complete the recursive formula of h(n).

h(1) =

h(n) = h(n-1)+

Answer:

In the given diagram, QP is tangent to a circle with centre O, RS is a straight line, T is a point on the circle, and PS bisects TPQ. We know that SPQ = 22°. Let's try to find out the value of the angle TPQ.

Since QP is tangent to the circle, the angle between RS and QP (i.e., angle RQP) is equal to the angle between QP and the radius drawn to the point of tangency (i.e., angle QOT). So, we can say that:

angle RQP = angle QOT

Also, since PS bisects TPQ, we can say that:

angle TPS = angle TPQ / 2

Now, let's consider the triangle TPQ. We know that:

angle TPQ + angle TQP + angle PTQ = 180° [Sum of angles in a triangle]

Substituting the values we have:

angle TPQ + angle TQP + (angle TPS + angle SPQ) = 180°

angle TPQ + angle TQP + (angle TPQ/2 + 22°) = 180°

Multiplying both sides by 2 to eliminate the fraction:

2(angle TPQ) + 2(angle TQP) + angle TPQ + 44° = 360°

Simplifying:

3(angle TPQ) + 2(angle TQP) = 316°

We don't know the values of angle TPQ and angle TQP, so we can't solve this equation exactly. However, we do know that these angles are both less than 180° (since they are angles in a triangle). Therefore, we can try some values for angle TPQ (let's call it x) and see if we can find a corresponding value for angle TQP that satisfies the equation.

If we take x = 40°, then we get:

3(40°) + 2(angle TQP) = 316°

120° + 2(angle TQP) = 316°

2(angle TQP) = 196°

angle TQP = 98°

Now, we can use the fact that angle TPS = angle TPQ / 2 to find angle TPS:

angle TPS = x/2 = 20°

Finally, we can use the fact that PS bisects TPQ to find angle PQT:

angle PQT = angle TPS

Step-by-step explanation: