solve the systems of equations using elimination
2x-7y=-13
8x-7y=11

Answer:

X        Y

2        1

4        7

5        10

Step-by-step explanation:

Answer:

CF = 7.2 cm

Step-by-step explanation:

given 2 chords intersecting inside a circle , then the product of the parts of one chord is equal to the product of the parts of the other chord, that is

BF ×FC = DF × EF

10x = 8 × 9 = 72 ( divide both sides by 10 )

x = CF = 7.2 cm

There are 24 different ways they can stand in line.

By choosing some items from a set and creating subsets, permutation and combination are two approaches to represent a group of objects. It outlines the numerous configurations for a particular set of data. Permutations are the selection of data or objects from a set, whereas combinations are the order in which they are represented.

There are four students, and each one can be in any one of the four positions in the line. Therefore, the total number of different ways they can stand in line is:

4 × 3 × 2 × 1 = 24

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The piecewise function for the graph is given as follows:

A piecewise function is a function that has different definitions, depending on the input x of the function.

The three different definitions for the function in this problem are given as follows:

For x < -4, the function is constant at y = -2, hence:

y = -2, x < -4.

For -4 < x ≤ 2, the function is linear, with an slope of 0.5 and intercept of 4, hence:

y = 0.5x + 4, -4 < x ≤ 2

For x > 2, the function is also linear, with slope of -1.5, hence at x = 0 it would assume a value of 1, thus:

y = -1.5x + 1, x > 1.

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Answer:

C

Step-by-step explanation:

under a reflection in the x- axis

a point (x, y ) → (x, - y ) , then

B (3, 8 ) → B' (3, - 8 )

The given equations having infinitely many solutions.

What is Solutions of system of equation?

A solution to a system of equations is a collection of variable values that satisfy all of the equations at the same time. To solve a system of equations, one must determine all of the sets of variable values that compose the system's solutions.

The solution to the system of equations y = -2x + 1 and 4x + 2y = -1 can be determined graphically by plotting both equations on the same set of axes and finding the points of intersection.

If there is exactly one point of intersection, then that point represents the unique solution to the system. If there are no points of intersection, then the system has no solution. If there are infinitely many points of intersection, then the system has infinitely many solutions.

Based on the information you provided, the system has two points of intersection: (0, -3) and (-3, 0). This means that the system has two solutions, and the solution set is the set of all points on the line that passes through these two points.

Therefore, The given equations having infinitely many solutions.

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Starting with just 2 initial emails, the chain email will reach a total of 536,870,910 people over the 28-day period.

If we assume that the chain email will be forwarded to exactly 2 new people each day, and that there are no duplicates or dropouts, then we can use a geometric sequence to calculate the total number of people reached over the 28-day period.

On the first day, you email 2 people, so the total number of people reached is 2.

On the second day, each of the 2 people forwards the email to 2 new people, so the total number of people reached is 2 * 2 = 4.

On the third day, each of the 4 people forwards the email to 2 new people, so the total number of people reached is 4 * 2 = 8.

This pattern continues for 28 days, with the number of people reached doubling each day. Therefore, the total number of people reached over the 28-day period is:

2 + 4 + 8 + 16 + ... + 2^28

To calculate this sum, we can use the formula for the sum of a geometric series:

S = a(1 - r^n) / (1 - r)

where a is the first term (2), r is the common ratio (2), and n is the number of terms (28).

Plugging in these values, we get:

S = 2(1 - 2^28) / (1 - 2)

= 2(1 - 268,435,456) / (-1)

= 536,870,910

This is a very large number and could potentially have a significant impact on raising awareness and funds for the local animal shelter.

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Since Hank is allergic to chocolate, he cannot eat Reese's, Snickers, Hershey's bars, or any other type of chocolate candy.

Therefore, the only candy that Hank can eat is the Sour Patch Kids and Skittles.

The total number of Sour Patch Kids that Hank has is 5.

The total number of Skittles that Hank has is 6 packs, or 6 * the number of Skittles in one pack (let's assume it's 10 Skittles per pack). So, the total number of Skittles that Hank has is 6 * 10 = 60.

Adding the number of Sour Patch Kids and Skittles, the total number of candy that Hank can eat is 5 + 60 = 65.

The total amount of candy that Hank has is 8 Reece's + 12 Snickers + 5 Sour Patch Kids + 4 Hershey's bars + 6 packs of Skittles = 8 + 12 + 5 + 4 + 6 * 10 = 8 + 12 + 5 + 4 + 60 = 89.

The ratio of candy that Hank can eat to the total amount of candy he has is 65 / 89 = approximately 0.73, which can be expressed as a simplified fraction as 73 / 100.

Answer:

11:35

Step-by-step explanation:

no step by step explanation.

a) 0 kg of sugar is in the tank at the beginning., b) ds/dt = 0.08-(S/1120)*4, c) 0.32 kg of sugar is in the tank after 1 minute., d) 2.59 kg of sugar is in the tank after 84 minutes.

a) At the beginning, there is no sugar in the tank since it contains only pure water.

b) Let S(t) be the amount of sugar in the tank at time t (in minutes). The rate of change of S is given by the rate at which sugar enters the tank minus the rate at which it leaves. Since the solution enters at a rate of 4 L/min, and contains 0.08 kg of sugar per liter, the rate at which sugar enters is 0.08 kg/L * 4 L/min = 0.32 kg/min. Since the solution leaves at the same rate, the differential equation that models the situation is:

dS/dt = 0.32 - (S/1120) * 4

c) To find the amount of sugar after 1 minute, we need to solve the differential equation from part (b) with the initial condition S(0) = 0 (since the tank initially contains only water). One possible way to solve the differential equation is to use separation of variables:

dS/dt + (4/1120) S = 0.32

Multiplying both sides by dt and dividing by (0.32 - (4/1120) S), we get:

(1/S) dS = (4/0.32 - (1120/4)) dt

Integrating both sides from t = 0 to t = 1 and from S = 0 to S = S(1), we get:

ln(S(1)) - ln(0) = (1.25 - 280) * 1

S(1) = [tex]e^{0.25} * 1120[/tex] ≈ 300.92 kg

Therefore, after 1 minute, there is approximately 300.92 kg of sugar in the tank.

d) To find the amount of sugar after 84 minutes, we can solve the differential equation from part (b) numerically using an appropriate method such as Euler's method, or we can use an integrating factor to solve it analytically. One possible way to use an integrating factor is to multiply both sides of the differential equation by exp(4t/1120):

exp(4t/1120) dS/dt + (S/280) exp(4t/1120) = 0.32 exp(4t/1120)

This can be written as:

d/dt [S exp(4t/1120)] = 0.32 exp(4t/1120)

Integrating both sides from t = 0 to t = 84, we get:

[S(84) exp(4/1120 * 84)] - [S(0) exp(4/1120 * 0)] = ∫(0 to 84) 0.32 exp(4t/1120) dt

Since S(0) = 0 and exp(4/1120 * 84) is a constant, we can simplify this to:

S(84) = (1/exp(4/1120 * 84)) ∫(0 to 84) 0.32 exp(4t/1120) dt

Using integration by substitution with u = 4t/1120, we get:

S(84) = (1/exp(4/1120 * 84)) * (1120/4) * (0.32/4) * [exp(4/1120 * 84) - 1]

S(84) ≈ 301.53 kg

Therefore, after 84 minutes, there is approximately 301.53 kg of sugar in the tank.

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The complete question is:

A tank contains 1120 L of pure water. At a rate of 4 L/min, a solution that contains 0.08 kilogramme of sugar per litre enters the tank. At the same rate that it drains from the tank, the solution is mixed.

a) How much sugar is in the tank when it first starts?

b) With S representing the amount of sugar (in kg) at time t, write a differential equation which models the situation.

c) After 1 minute, calculate the sugar content (in kilogramme).

d) After 84 minutes, calculate the sugar content (in kg).

Answer:

8^4

Step-by-step explanation:

8^8 divided by 8^4

Because they have the same base and it is divided, so we just need to take ^8 - ^4 and get the answer

8^4

The predicted rodent population in the town in 2005 was approximately 6083.

From the question, we have the following parameters that can be used in our computation:

ŷ = 67.34x - 128,933.4

To find the rodent population in 2005, we need to substitute x = 2005 into the equation and solve for ŷ:

ŷ = 67.34(2005) - 128,933.4

So, we have

ŷ = 135016.7 - 128,933.4

Evaluate

ŷ = 6083

Hence, the predicted rodent population was 6083.

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The plane ticket to Barcelona is now £164.50. This is because 6% of £175 is £10.50 and if you subtract £10.50 from £175, it equals £164.50.

The area occupied by the ship is 10 inches².

The area of a parallelogram is -

A{||gm} = base x height

Given is that Ships in a first generation video game were modeled like the one shown in the image.

We can write the area occupied by the ship as -

Area = A{||gm} + A{triangle}

Area = {b x h} + {L x B}

Area = [tex]$(3\frac{2}{5}\times 2)\;+\; (3\frac{2}{5}-1)\times1\frac{1}{3}[/tex]

Area = (17/5 x 2) + (17/5 - 1) x (4/3)

Area = 34/5 + 12/5 x 4/3

Area = 34/5 + 16/5

Area = 50/5

Area = 10 inches²

Therefore, the area occupied by the ship is 10 inches².

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(1) The hypothesis is stated that completing a 2-week mindfulness training course

(2) The type of study design this is randomized controlled trial.

(3) The choice of the study type is randomized controlled trial is justified. (4) The list of the two variables with their operational definitions is 2-week mindfulness training course and GRE scores.

(5) Yes, this study demonstrate that the relationship between the two variables is causal

In a study conducted by Mrazek et al. (2013), it was found that students who completed a 2-week mindfulness training course scored higher on the GRE than those who did not participate in the training.

The hypothesis of this study is that completing a 2-week mindfulness training course will result in higher scores on the GRE compared to those who do not complete the training.

This study design is a randomized controlled trial. In this type of study, participants are randomly assigned to either a treatment or control group, and the effects of the treatment are compared to the effects of no treatment (or a placebo). In this case, the treatment group received the 2-week mindfulness training course, while the control group did not.

The choice of study type as a randomized controlled trial is justified because it allows for the comparison of two groups while minimizing the effects of confounding variables. Random assignment to groups helps to ensure that any differences in outcomes between the groups are due to the treatment and not some other factor.

The two variables in this study are the completion of the 2-week mindfulness training course and GRE scores. The operational definition of completion of the training course is that participants in the treatment group attended all sessions of the 2-week course. The operational definition of GRE scores is the score that participants received on the exam.

This study does suggest a causal relationship between completion of the mindfulness training course and higher GRE scores. The randomized controlled trial design helps to reduce the effects of confounding variables, making it more likely that any observed differences in outcomes between the treatment and control groups are due to the treatment.

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The cost of each pizza is $14 and the cost of each cool drink is $3.

A system of linear equations consists of two or more equations made up of two or more variables such that all equations in the system are considered simultaneously. The solution to a system of linear equations in two variables is any ordered pair that satisfies each equation independently.

Given that, John told Serena that when he ordered from Tony's last week, he paid $34 for two 16-inch pizzas and two drinks.

Let the cost of each pizza be x and the cost of each cool drink be y.

Now, 2x+2y=34

x+y=17 -------(i)

Jodi told Serena that when she ordered one 16-inch pizza and three drinks, it cost $23.

x+3y=23 -------(ii)

Subtract equation (i) from (ii), we get

x+3y-(x+y)=23-17

2y=6

y=3

Substitute y=3 in equation (i), we get

x=14

Therefore, the cost of each pizza is $14 and the cost of each cool drink is $3.

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Answer:

0.15 repeating

Step-by-step explanation:

Smaller sample size results in smaller sampling variation of the OLS estimator for the slope coefficient in the sample regression model due to the fact that it reduces the amount of variability in the data. Smaller error variance also reduces sampling variation as it reduces the amount of overall variation in the data.

The sampling variation of the OLS estimator for the slope coefficient in the sample regression model is affected by a variety of factors. A smaller sample size will result in smaller sampling variation because it reduces the amount of variability in the data. This is due to the fact that a smaller sample size will contain less variation in the independent variable, and therefore the estimated slope coefficient will have less variation. Additionally, a smaller error variance will also reduce the sampling variation as it reduces the amount of overall variation in the data. Finally, smaller variation in the independent variable in the sample will also lead to smaller sampling variation of the OLS estimator. This is because the slope coefficient is estimated by minimizing the sum of squared residuals, which is a function of the variation in the independent variable. Thus, if the variation in the independent variable is reduced, the slope coefficient will have less variation. In conclusion, all three factors can lead to reduction in the sampling variation of the OLS estimator for the slope coefficient in the sample regression model.

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Option B. Bob continues his research because even though there is no linear relationship here, there could be a different relationship.

A correlation coefficient of 0.05 indicates a very weak linear relationship between the number of bedrooms in a home and its selling price. In other words, the number of bedrooms in a home does not seem to be a strong predictor of its selling price based on the data that Bob has analyzed. However, this does not mean that there is no relationship at all between these two variables. There could be a different type of relationship, such as a non-linear relationship, that is not captured by the linear correlation coefficient. It's possible that Bob will need to use other techniques, such as regression analysis, to better understand the relationship between the number of bedrooms in a home and its selling price.

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The elevator is on the 14th floor at this situation.

What is the basic arithmetic operation?

Arithmetic operations are mathematical operations that involve basic calculations such as addition, subtraction, multiplication, and division. These operations are used to perform calculations with numbers and are used in a wide range of mathematical and real-life situations.

If the elevator is on the 18th floor, and it moves down 16 floors, it will be on the 2nd floor.

After that, the elevator comes up 12 floors from the 2nd floor. So, it will be on the floor:

2 + 12 = 14

Therefore, the elevator is on the 14th floor at this situation.

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Answer:

Step-by-step explanation:

-8^8 is -16777216.

-8^5 is -32768.

-16777216/-32768 is 512.

btw, is this bigideas? lol i remember this website

a. The oldest grandchild got the most ice cream.

b. The remaining ice cream will be represented by a fraction of 59/100 of the original amount.

A fraction is defined as a numerical representation of a part of a whole that represents a rational number.

a. The oldest grandchild got the most ice cream.

b. Let's first calculate the fraction of the ice cream that was left after serving the youngest and middle grandchild.

The youngest grandchild received 1/5 of the ice cream, which means 4/5 was left.

Then the middle grandchild got 1/4 of the remaining 4/5, which is 1/5. So 4/5 - 1/5 = 3/5 of the ice cream is left.

Now, if Grandpa Mick serves himself the same amount as the second grandchild (1/4 of the original amount), he will be taking 1/4 of 1/5 of the original amount, which is 1/20.

So the remaining ice cream will be 3/5 - 1/20 = 59/100 of the original amount.

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The question seems incomplete, the missing part would be as:

Grandpa Mick opened a pint of ice cream. He gave his youngest grandchild 1/5 of the ice cream and his middle grandchild 1/4 of the remaining ice cream. Then, he gave his oldest grandchild 1/3 of the ice cream that was left after serving the other. a. Who got the most ice cream?  b. What fraction of the pint of ice cream will be left if Grandpa Mick serves himself the same amount as the second grandchild?

Answer: Neither

3, 5, 9,17

+ 2 +2

They are not the same #'s.  For example, if you add 5 and 2 together you get  7. 9 does not equal 7. Not arithmetic,  or geometric sequence.

On solving the provided question we can say that The result of multiply the total number of kids by the proportion of those who enjoy chocolate is 12

Along with addition, subtractiοn, and division, multiplication is one of the four arithmetic operations. Multiplicatiοn in math refers to regularly adding groups of the same size. The formula for multiplication is multiplicand multiplier Equals prοduct.

Specifically, multiplicand: First number (factοr). divider: Second number (factor). After multiplying the multiplicand and the multiplier, the result is knοwn as the product. Multiple additiοns are made while adding numerals. as in 5 times 4 Equals 5 + 5 + 5 + 5 = 20, I multiplied 5 by 4 times. Multiplication is frequently referred tο as "doubling" because οf this.

The result of multiply the tοtal number of kids by the proportion of those who enjoy chocolate is

32 × 3/8 = 12

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The standard deviation of the data set is  0.7.

First, calculate the mean of the data set:

(mean) = (2+1+1+2+2+3)/6 = 11/6 ≈ 1.8

Next, calculate the deviation of each data point from the mean:

2 - 1.8 = 0.2

1 - 1.8 = -0.8

1 - 1.8 = -0.8

2 - 1.8 = 0.2

2 - 1.8 = 0.2

3 - 1.8 = 1.2

Now square each deviation:

0.2² = 0.04

(-0.8)² = 0.64

(-0.8)² = 0.64

0.2² = 0.04

0.2² = 0.04

1.2² = 1.44

The sum of the squared deviations is:

0.04 + 0.64 + 0.64 + 0.04 + 0.04 + 1.44 = 2.84

To find the variance, we divide by the number of data points:

variance = 2.84/6 ≈ 0.4733

Finally, take the square root of the variance to get the standard deviation:

standard deviation = √(0.4733) ≈ 0.69

Therefore, the standard deviation of the data set {2,1,1,2,2,3} is approximately 0.7 (rounded to the nearest tenth).

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Answer:

Step-by-step explanation:

Step-by-step explanation:

Let's call the number of purple counters "x". This means that the number of blue counters is x - 78, and the number of white counters is 18x.

According to the ratio, the sum of the number of purple and blue counters is 16x + (x - 78) = 17x - 78.

And the sum of all counters is 16x + 18x + 3x = 37x.

Knowing that the sum of all counters is the same, we can set the two sums equal to each other:

37x = 17x - 78 + 37x

So, we have:

74x = 17x - 78 + 37x

57x = -78

x = -78/57

Since x can't be negative, we have to reject this solution.

However, the number of white counters can be found by multiplying 18 by the number of purple counters:

18 * x = 18 * (x/57) = (18/57) * x = (18/57) * 78 = 72

Therefore, there are 72 white counters in the bag.

Answer: D. the division property of equality

Step-by-step explanation:

In step three you will be dividing -2.5 divided by -0.3 to get a.

The probability of Nishtha using Rs 5 coin is  [tex]\frac{1}{4}[/tex] , if she needs to pay for a pencil Rs 4.

P(E) = number of favorable outcomes / total number of outcomes

Denominations of coins = ₹1, ₹2, ₹5 and ₹10 each

Total number of coins = 4

Coins that can pay the amount = ₹5 and ₹10

Number of Favorable Outcomes = 2

For the probability of using two coins :-

P(E) = [tex]\frac{2}{4} = \frac{1}{2}[/tex]

we have to find the probability of using ₹5 coin. And here the probability of using of ₹5 coin and ₹10 coin are equal likely. So using of ₹5 coin is 50% of the probability of using both coin

P(rs5) = [tex]50\% \times \frac{1}{2}[/tex]

         = [tex]\frac{1}{4}[/tex]

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Answer: pay attention

Step-by-step explanation: