I NEED HELP WITH MATH PLEASE

Answer:

Step-by-step explanation:

IF point E lies on the line segment DF, this means that all the points DEF are collinear and DE+EF = DF.

Given parameter

DE = 6

DF = 9

Required

EF

Substituting the given parameter into the expression above to get the required will be;

DE+EF = DF.

EF = DF-DE

EF = 9-6

EF = 3

Hence the length of EF is equivalent to 3

Answer: 15 Times

Step-by-step explanation: It's 15 Times because if you add all of the other rolled times together you'll get 60 and 75-60=15.

The Constraints of the inequality are

x ≤ 2y + 500

22500  < √ 35x + 50y

Mathematical expressions with inequalities are those in which the two sides are not equal. Contrary to equations, we compare two values in inequality. Less than (or less than or equal to), greater than (or greater than or equal to), or not equal to signs are used in place of the equal sign.

Given:

The Company A (x) at most 500 more than twice then unit by B(y).

So, x ≤ 2y + 500

Now, the square of Company Profit will be equal to 35x + 50y

Then, the constraints will be

1. x ≤ 2y + 500

2. Company Profit² < 35x + 50y

Company Profit < √ 35x + 50y

22500  < √ 35x + 50y

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The graph of the system of inequalities is attached to the solution.

Given is a system of inequalities, y > -x/3+5 and y ≥ 3,

So, we will simply find the coordinates of both the inequalities, and plot them,

We know that the solution of a system of inequalities is all the part which is common in both the inequalities.

So, here the first inequality,

y > -x/3+5

Finding the coordinates,

y = -x/3+5

Put x = 0

y = 5

(0, 5)

Put y = 0,

x = 15

(15, 0)

Therefore, the inequality will pass from these two lines, and since the sing is > so the shaded part will be above the line and the line will be dotted.

And y ≥ 3,

In this inequality the graph will simply pass by y = 3 and since the sing is ≥ so the shaded part will be above the line and the line will solid line.

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Answer:

-36, 4

Step-by-step explanation:

r/6 < -6

Multiply both sides by 6

r < -36

4r + 2 > 18

Subtract 2 from both sides

4r > 16

Divide both sides by 4

r > 4

The growth rate of the bacterial colony after 3 hours is 32%, the population of a slowly growing bacterial colony after t hours is given by the function p(t) = 100 + 24t + 2t²

The growth rate of the colony is the rate of change of the population, which is given by the derivative of the function. The derivative of p(t) is p'(t) = 24 + 4t

The growth rate after 3 hours is p'(3) = 24 + 4 * 3 = 32. This means that the population of the colony is increasing by 32% after 3 hours.

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Answer:

8

Step-by-step explanation:

maths go brrrrrrrrrrr

Exponential smoothing, simple moving averages, autoregressive models, and regression-based models are all commonly used methods for analyzing and forecasting seasonal data.

Regression-based models are statistical models that use the relationship between a dependent variable and one or more independent variables to predict or explain the behavior of the dependent variable. These models estimate the strength and direction of the relationships between the variables by fitting a regression line or curve to the observed data. They can be used for both descriptive and predictive purposes and are widely used in various fields, including economics, finance, marketing, and social sciences. Examples of regression-based models include linear regression, logistic regression, and time-series regression.

Here,

Seasonal data refers to data that exhibits regular patterns that repeat over a fixed time period, such as weekly, monthly, or yearly. The methods that are best for dealing with seasonal data are those that take into account the regular patterns and fluctuations in the data over time. Methods that are best when you are dealing with seasonal data:

a. Exponential smoothing

c. Simple moving averages

d. Autoregressive models

e. Regression based models

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Answer:

7.5 percent.

Step-by-step explanation:

The denominator of the formula for the variance of a sample is given as follows:

N - 1.

A fraction is a numerical representation of the division of the two terms x and y that composed the fraction, as follows:

Fraction = x/y.

The terms are named as follows:

The formula for the variance of a sample is given as follows:

\(s^2 = \frac{sum (X - \overbar{X})^2}{N - 1}\)

Hence the denominator is the bottom term, which is of N - 1.

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The metric unit from pounds to tons is 250 pounds = 0.125 tons

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

250 pounds = how many tons

As a general rule, we have

1 pound = 0.0005 tons

Multiply both sides of the equation by 250

So, we have

250 * 1 pound = 0.0005 tons * 250

Evaluate the products

250 pounds = 0.125 tons

Hence, the conversion is 250 pounds = 0.125 tons

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Answer:

D.

Step-by-step explanation:

-11.74

Answer:

0$

Step-by-step explanation:

100% off 50 dollars is 50 dollars so if it costed 50 now it costs 0

Since the algae grow exponentially with doubling time of 4 days, then the population will be quadruple in size in 8 days and will be triple in size in  6.34 days.

The easiest way is to consider the situation as a geometric sequence. If the population doubles its size in 4 days, then it will be quadruple in:

2 x 4 days = 8 days.

In general, we can use the growth formula:

P(t) = Po . 2^(t/Td)

Where:

P(t) = population at time t

Po = initial population

Td = doubling time

Parameters given:

Td = 4 days

P(t) = 3Po

Plug those parameters into the formula:

3 Po = Po . 2^(t/4)

3 = 2^(t/4)

log 3 = (t/4) log 2

t = 4 . log 3 / log 2 = 6.34 days.

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The model used by Victor in the linear equation is incorrect,

The parameters are that;

Victor saved: $89.25

Cost of the bicycle = $129.85

Thus, to find the amount extra that he will need to purchase the bicycle, the equation model should be;

$89.25 + x = $129.85

This can be expressed in words as;

The amount of money he already has saved + the amount of money he still requires = the total price of the bike.

An equation that correctly represents this problem can show the sum of the amount of money he already has and the amount of money he needs equals the total cost of the bicycle

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Complete question is;

Victor has saved $89.25 for the bicycle that he wants. The bicycle costs $129.85. Victor writes the equation below to help him determine the additional amount that he needs to solve to have enough to buy the bicycle.

89.25 + 129.85 = x

Does Victor's equation correctly model the problem?

Answer:

She swims 9m in one second

Step-by-step explanation:

Given:

Ricardo is 4 years less than twice as old as his sister.

The sum of their ages is 20.

To find:

Ricardo's age.

Explanation:

Let R be Ricardo's age.

Let S be his sister's age.

According to the question,

Substituting equation (1) in (2) we get,

Substituting S = 8 in equation (2) we get,

Therefore, Ricardo's age is 12.

Final answer:

Ricardo's age is 12.

Answer:

A/C

Step-by-step explanation:

Since the sum of the angles in a triangle equals 180°, and angle C is 90°.

That means angles A and B add up to 90°, that is, they are complementary angles. Therefore the cosine of B equals the sine of A.

We saw on the last page that sin A was the opposite side over the hypotenuse, that is, a/c. Hence, cos B equals a/c.

Your welcome! :)

Answer:

8.6791453e+41

Step-by-step explanation:

i used calulator

The efficiency approaches 1, which means that θˆ1 and θ² become equally efficient estimators of θ

Linearity of expectation is a property of probability theory that states that the expected value of the sum of random variables is equal to the sum of their individual expected values.

According to the given information:

In this problem, we are given a random sample Y1, Y2, ..., Yn from a uniform distribution on the interval (θ, θ + 1), and we need to find estimators θˆ1 and θˆ2 for the unknown parameter θ.

To show that θˆ1 = Y¯ − 1/2 is an unbiased estimator of θ, we need to show that E(θˆ1) = θ. Using the linearity of expectation, we have:

E(θˆ1) = E(Y¯) - 1/2

= E((Y1 + Y2 + ... + Yn)/n) - 1/2

= (E(Y1) + E(Y2) + ... + E(Yn))/n - 1/2

= (nθ + n/2)/n - 1/2

= θ.

Therefore, θˆ1 is an unbiased estimator of θ.

Similarly, to show that θ² = Y(n) - n/(n+1) is an unbiased estimator of θ, we need to show that E(θ²) = θ. Using the fact that the distribution of Y(n) is given by fY(n)(y) = n(y-θ)n-1 for θ ≤ y ≤ θ+1, we have:

E(θˆ2) = E(Y(n)) - n/(n+1)

= ∫θ^(θ+1) y fY(n)(y) dy - n/(n+1)

= ∫θ^(θ+1) y n(y-θ)n-1 dy - n/(n+1)

= θ + 1/2 - n/(n+1)

= θ.

Therefore, θ² is also an unbiased estimator of θ.

To find the efficiency of θˆ1 relative to θ², we can use the formula:

Efficiency = (Var(θ²))/Var(θˆ1))

To find the variances, we first note that the variance of Y(n) is given by Var(Y(n)) = (1/12n)(1+(n-1)(1/n-1)). Using this, we have:

Var(θˆ1) = Var(Y¯)/n = Var(Y1)/n = 1/12n,

Var(θ²) = Var(Y(n))/(n+1)² = (1/12n)(1+(n-1)(1/n-1))/(n+1)²

Therefore, the efficiency of θˆ1 relative to θ² is:

Efficiency = (Var(θ²))/Var(θ))

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

= 1 + (n-1)/(n+1)²

As n approaches infinity, the efficiency approaches 1, which means that θˆ1 and θ² become equally efficient estimators of θ

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B) ∅ (empty set); The composition T ∘ S is an empty set (∅) because there are no ordered pairs that satisfy both the conditions of the relations T and S.

To find the composition T ∘ S, we need to determine the set of ordered pairs that satisfy both relations S and T. Let's analyze the definitions of S and T:

S = {(x, y) ∣ x < y}

T = {(x, y) ∣ x > y}

To find T ∘ S, we need to check if there exists an element z such that (x, z) is in T and (z, y) is in S for any (x, y) in the given relations. However, if we observe the definitions of S and T, we can see that there is no common element that satisfies both relations.

For any (x, y) in S, we have x < y, but in T, the relation is defined as x > y. Therefore, there are no elements that satisfy both conditions simultaneously.

As a result, T ∘ S will be an empty set (∅) because there are no ordered pairs that satisfy the composition of the two relations.

The composition T ∘ S is an empty set (∅) because there are no ordered pairs that satisfy both the conditions of the relations T and S.

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keeping in mind that parallel lines have exactly the same slope, let's check for the slope of the equation above

\(x-3y=9\implies -3y=-x+9\implies y=\cfrac{-x+9}{-3} \\\\\\ y=\cfrac{-x}{-3}+\cfrac{9}{-3}\implies y=\cfrac{1}{3}x-3\qquad \impliedby \begin{array}{|c|ll} \cline{1-1} slope-intercept~form\\ \cline{1-1} \\ y=\underset{y-intercept}{\stackrel{slope\qquad }{\stackrel{\downarrow }{m}x+\underset{\uparrow }{b}}} \\\\ \cline{1-1} \end{array}\)

so we're really looking for the equation of a likne whose slope is 1/3 and it passes through (-10 , 9)

\((\stackrel{x_1}{-10}~,~\stackrel{y_1}{9})\hspace{10em} \stackrel{slope}{m} ~=~ \cfrac{1}{3} \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{9}=\stackrel{m}{ \cfrac{1}{3}}(x-\stackrel{x_1}{(-10)}) \implies y -9= \cfrac{1}{3} (x +10) \\\\\\ y-9=\cfrac{1}{3}x+\cfrac{10}{3}\implies y=\cfrac{1}{3}x+\cfrac{10}{3}+9\implies {\Large \begin{array}{llll} y=\cfrac{1}{3}x+\cfrac{37}{3} \end{array}}\)

Answer:

37

Step-by-step explanation:

i think, quick math if you doubt me wait for another answer

The probability that exactly 30 drivers out of 600 say they read the newspaper while driving.

To find the probability that exactly 30 out of 600 randomly selected American drivers say they read the newspaper while driving, we can use the binomial probability formula.

The formula is P(X=k) = C(n,k) * p^k * (1-p)^(n-k), where:
- P(X=k) is the probability of getting exactly k successes
- C(n,k) is the number of combinations of n items taken k at a time
- p is the probability of success for each trial
- n is the total number of trials

In this case, the probability of a driver reading the newspaper while driving is given as 5%, or 0.05. So p = 0.05, and the number of trials is 600 (n = 600). We want to find the probability of exactly 30 drivers saying they read the newspaper while driving (k = 30).

Using the formula, the probability is:
P(X=30) = C(600,30) * 0.05^30 * (1-0.05)^(600-30)

Calculating this value will give you the probability that exactly 30 drivers out of 600 say they read the newspaper while driving.

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The mean absolute percent error (MAPE) is 25%.

The mean absolute percent error (MAPE) is a measure of forecasting accuracy that quantifies the average deviation between predicted and actual values as a percentage of the actual values. In this case, the mean absolute deviation (MAD) is given as 25 units for the past 10 periods, and the total demand is 1,000 units.

To calculate the MAPE, we need to divide the MAD by the total demand and multiply by 100 to express it as a percentage. In this scenario, the MAPE is calculated as follows:

MAPE = (MAD / Total Demand) * 100

     = (25 / 1,000) * 100

     = 2.5%

Therefore, the MAPE is 2.5%, which means that, on average, the forecasts have a 2.5% deviation from the actual demand.

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Answer:

The answer is (-9, 5). Hope this helps.

Answer:

Because it's all angles are equal (AAA) and that is no rule to show triangles congeruent but they are similar.