Can someone please help me I really need help please help me thank you

Answer:

1. If the roots of the quadratic equation ax2 + bx + c = 0 are real, irrational, and unequal, then the value of the discriminant is

2. Factored completely, the expression 16 tanθ - tan3θ is equivalent to

3. High school officials wanted to assess the need for a new diving board. They created a survey and distributed it to a large, diverse crowd at the State Swim Meet held at their school. Which characteristic of the survey is most likely to create a bias?

4. Which expression is equivalent to cos P cos 50 - sin P sin 50?

5. What is the product of the roots of the quadratic equation 2x2 - x = 4? 6. In which method of data collection does the researcher intentionally intervene to arrange for a comparison of results?

7. Which equation could be represented by the graph below?

8. The first four terms of the sequence with a1 = 40 and an = 3/4 an-1 are

9. Which diagram represents an angle of 7/4 pi; radians in standard position?

Step-by-step explanation:

Answer:

The one with the √

Step-by-step explanation:

If it has a √ it always means its irrational

Hope this helps!

Answer:

i think its 90 cuz they seem perpendicular

The number of weeks taken by Lara to collect all 100 pokemon cards is 26 weeks.

For the given question-

Initial pokemon cards Lara had: 23 cards

Collection each week : 3

Total cards to  be collected : 100

Let the number of weeks be 'x'.

So,

Linear equation forms:

23 + 3x = 100

Simplifying:

3x = 100 - 23

3x = 77

x = 25.66

x = 26 weeks

Thus, the number of weeks taken by Lara to collect all 100 pokemon cards is 26 weeks.

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the complete question -

lara began collecting pokemon cards her brother gave her 23 cards to start her collection she plans to buy 3 new cards each week her goal is to collect 100 cards. Find the number of weeks.

Answer:

(3,5)

Step-by-step explanation:

We first need to substitute x for 3 in the equation :)

y = 2(3) - 1

y = 6 - 1

y = 5

The cordinate will be (3,5)

Have an amazing day!!

Please rate and mark brainliest!!

Instead of attempting to remember each numeral individually, Wayne chooses to memorize the series of four ages. Wayne is employing a tactic known as "chunking."

In a "chunking" project, students rewrite the "portions" of a challenging material in their own words after breaking it down into more digestible chunks.

Thus, when instead of attempting to remember each numeral individually, Wayne chooses to memorize the series of four ages. Wayne is employing a tactic known as "chunking."

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The null hypothesis (H0) states that the average age is equal to or greater than 30.8 years, while the alternative hypothesis (Ha) states that the average age is less than 30.8 years.

In hypothesis testing, we set up the null hypothesis (H0) and the alternative hypothesis (Ha) to investigate a claim or conjecture. In this case, the conjecture is that the average age of a senior surgical resident in the United States is less than 30.8 years old.

The null hypothesis (H0) assumes that the average age is equal to or greater than 30.8 years, and any difference observed in the sample is due to random chance or sampling variability. Therefore, the null hypothesis can be stated as:

H0: The average age of senior surgical residents in the United States is greater than or equal to 30.8 years.

The alternative hypothesis (Ha) represents the claim or the opposite of the null hypothesis. In this case, the alternative hypothesis states that the average age is less than 30.8 years, indicating that there is a significant difference or evidence against the null hypothesis. Therefore, the alternative hypothesis can be stated as:

Ha: The average age of senior surgical residents in the United States is less than 30.8 years.

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The test that will allow you to analyze the differences in blood pressure between groups, after adjusting for age is the one way ANOVA test.

One-way analysis of variance is a statistical approach that can be used to determine if the means of two samples are substantially different or not. One-way ANOVA ("analysis of variance") examines the means of two or more independent groups to see if there is statistical evidence that the related population means differ significantly.

One-way ANOVA is commonly employed when there is a single independent variable, or factor, and the purpose is to determine whether fluctuations or various amounts of that factor have a measurable effect on a dependent variable. This van be used to illustrate the relationship.

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The value of the piecewise function for f(3) is 4

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

f(x) = 2x if x < 1

f(x) = 1/2x + 5/2 if x >= 1

The function f(3) implies that we make use of the function

f(x) = 1/2x + 5/2

This is because it is valid for x >= 1

substitute the known values in the above equation, so, we have the following representation

f(3) = 1/2 * 3 + 5/2

Evaluate

f(3) = 4

Hence, the piecewise function for f(3) is 4

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Answer:

the y-intecept of the line is (0, -6)

Step-by-step explanation:

Given the linear equation in slope-intercept form: y = mx + b

where:

m = slope  = 4

b = y-intercept = -6

The y-intercept is the value of y when x = 0.

Plug x = 0 into the equation to solve for the y-intercept:

y = 4x - 6

y = 4(0) - 6

y = 0 - 6

y = -6

Therefore, the y-intecept of the line is (0, -6)

Answer:

y=-6

Step-by-step explanation:

y-intercept (make x=0)

y=4x-6

y=4(0)-6

y=0-6

y=-6

(0,-6)

The closest option to Suzanne's z-score of 0.33 is 0.33.

To calculate Suzanne's z-score, we need to use the formula:

z = (x - μ) / σ

where:

x = Suzanne's number of push-ups (13)

μ = mean number of push-ups (11)

σ = standard deviation (6)

Substituting the values into the formula:

z = (13 - 11) / 6

z = 2 / 6

z = 0.33

The z-score represents the number of standard deviations a data point (in this case, Suzanne's number of push-ups) is away from the mean. In this scenario, Suzanne's z-score is 0.33, which indicates that her number of push-ups is 0.33 standard deviations above the mean.

A positive z-score means the data point is above the mean, and a negative z-score means it is below the mean. In this case, Suzanne's z-score of 0.33 suggests that she is slightly above average in terms of the number of push-ups she can do, compared to the general population.

Based on the given answer choices, the closest option to Suzanne's z-score of 0.33 is 0.33.

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n the case of errors-in-variables bias, the OLS estimator is consistent but no longer unbiased in small samples. This is the correct statement.

In statistics, the errors-in-variables bias is a form of statistical bias that occurs when an independent variable (IV) is measured with error. The presence of the errors-in-variables (EIV) bias means that the OLS estimator will be consistent but no longer unbiased. This means that the OLS estimator can still give reliable estimates, but the estimates are no longer accurate.

The errors-in-variables (EIV) bias can be corrected by using methods such as instrumental variables or two-stage least squares (2SLS) regression. In small samples, the EIV bias can have a more significant impact on the accuracy of the OLS estimator.

In such cases, other estimation methods such as maximum likelihood estimation or the generalized method of moments (GMM) may be used to improve the accuracy of the estimates

Therefore, option C: the OLS estimator is consistent but no longer unbiased in small samples, is the correct .

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By percentage, a passive home construction is typically around 50% more expensive compared to a conventional home construction.

A passive home construction is generally more expensive compared to a conventional home construction due to several factors. Passive homes are designed to meet stringent energy efficiency standards, requiring specialized materials, insulation, ventilation systems, and high-performance windows and doors. These energy-saving features contribute to the increased cost of construction. Additionally, passive homes often incorporate advanced technologies like heat recovery systems and solar panels, further adding to the expenses.

However, it's important to note that while the initial construction costs of a passive home may be higher, the long-term energy savings and reduced operating costs can offset the higher upfront investment. Passive homes offer improved energy efficiency, better indoor comfort, and reduced environmental impact, making them a viable choice for those seeking sustainable and energy-efficient housing solutions.

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To test the hypothesis of independence between the shift and reported symptoms in the given study, we can perform a chi-square test of independence.

The null hypothesis (H0) is that the shift and reported symptoms are independent, while the alternative hypothesis (H1) is that they are not independent.

To calculate the chi-square test using the P-value method with the TI-84 Plus calculator, you can follow these steps:

1 Enter the observed data into the calculator:

Observed Frequencies:

                   Morning Shift  Evening Shift  Night Shift

Influenza                 12              19            20

Headache                  18              34             5

Weakness                  10              10             7

Shortness of Breath       11               9             3

Perform the chi-square test:

Go to the STAT menu, then select TESTS, and choose Chi-square Test (GOF) or Chi-square Test (Contingency). Enter the observed frequencies and expected frequencies (if applicable) based on the assumption of independence.

Calculate the P-value:

The calculator will compute the test statistic and the corresponding P-value.

Determine the conclusion:

Compare the obtained P-value with the significance level (α = 0.01). If the P-value is less than or equal to the significance level, reject the null hypothesis.

If the P-value is greater than the significance level, fail to reject the null hypothesis.

Based on the obtained P-value and the given significance level (α = 0.01), you can conclude whether to reject or fail to reject the null hypothesis.

Unfortunately, without the specific output of the chi-square test from the TI-84 Plus calculator, I cannot provide the exact conclusion.

Regarding the nature of the test, the hypothesis test for independence in this case is a two-tailed test since the alternative hypothesis (H1) states that the shift and reported symptoms are not independent, without specifying a particular direction.

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Answer:

true

Step-by-step explanation:

v=cm 3/m/3 /litres

area into boundary is volume

Answer:

Step-by-step explanation:

The coefficient is the number part.

Answer:

9

Step-by-step explanation:

Correct me if i'm wrong

Let's simplify each expression shown in the exercise:

Option a

Given:

You can apply the Product of powers property. This states the following:

Where "b" is the base and "n" and "m" are exponents.

Then, you get:

By definition:

Therefore:

The expression given in Option a is equal to 1.

Option b

Knowing that any number or expression with exponent zero is equal to 1, you get that:

The expression given in Option b is equal to 1.

Option c

Given:

You can notice that the numerator and the denominator are equal, then:

The expression given in Option c is equal to 1.

Option d

Given:

You can simplify it using the Quotient of powers property, which states that:

Then, you get:

The expression given in Option d is not equal to 1.

The answer is: Option d.

Answer:

Acceleration

\(a=\left(2t-\dfrac{3}{5}\right)\:\sf ms^{-2}\)

Part (A)

Velocity

\(\begin{aligned}\displaystyle v= \int a\:dt & =\int \left(2t-\dfrac{3}{5}\right)\:dt\\\\ & = t^2 -\dfrac{3}{5}t+C \end{aligned}\)

\(\begin{aligned} \textsf{As }\:v(0)=10 \implies (0)^2-\dfrac{3}{5}(0)+C & =10\\C & = 10 \end{aligned}\)

\(\implies v(t)=\left(t^2-\dfrac{3}{5}t+10\right)\: \sf ms^{-1}\)

Part (B)

Displacement

\(\begin{aligned}\displaystyle s= \int v\:dt & =\int \left(t^2-\dfrac{3}{5}t+10\right)\:dt\\\\ & = \dfrac{1}{3}t^3-\dfrac{3}{10}t^2+10t+C \end{aligned}\)

\(\begin{aligned} \textsf{As }\: s(0)=5 \implies \dfrac{1}{3}(0)^3-\dfrac{3}{10}(0)^2+10(0)+C & =5\\C & = 5\end{aligned}\)

\(\implies s(t)=\left(\dfrac{1}{3}t^3-\dfrac{3}{10}t^2+10t+5\right)\: \sf m\)

Part (C)

(i)  t = 2 s

\(v(2)=(2)^2-\dfrac{3}{5}(2)+10=\dfrac{64}{5}=12.8\: \sf ms^{-1}\)

\(s(2)=\dfrac{1}{3}(2)^3-\dfrac{3}{10}(2)^2+10(2)+5=\dfrac{397}{15}=26.47\: \sf m\:(2\:dp)\)

(ii) t = 5 s

\(v(5)=(5)^2-\dfrac{3}{5}(5)+10=32\: \sf ms^{-1}\)

\(s(5)=\dfrac{1}{3}(5)^3-\dfrac{3}{10}(5)^2+10(5)+5=\dfrac{535}{6}=89.17\: \sf m\:(1\:dp)\)

Answer:

C

Step-by-step explanation:

421-376 will get you the answer to how much it increased and dividing 376 by your answer will get you the percent increase.

It's 16.

The difference between two consecutive numbers is one more than between the previous two numbers.

1+1=2+2=4+3=7+4=11+5=16+6=22

Answer:

I’m backk

Step-by-step explanation:

First, we have to set a number line:

We can see, that of we move left to right, 12 is greater than -29.

SO:

12 > -29

The expression given is 30 x [(9 x 2) - (4 + 3)]. In order to find which expression has a value of 1, we must simplify the expression. First, we must solve the parentheses by adding 4 and 3 together, which equals 7, and multiplying 9 and 2 together, which equals 18.

So, the expression now becomes 30 x [18 - 7]. Next, we must solve the brackets by subtracting 7 from 18, which equals 11. So, the expression now becomes 30 x 11. Finally, we must multiply 30 and 11 together to get the final answer, which is 330. Therefore, the given expression does not have a value of 1.
Hello! Let's solve the given expression and check if its value is 1.

Expression: 30 x [(9 x 2) - (4 + 3)]

Step 1: Perform operations within the parentheses first.
9 x 2 = 18
4 + 3 = 7

Step 2: Substitute these values back into the expression.
30 x (18 - 7)

Step 3: Perform subtraction inside the parentheses.
30 x (11)

Step 4: Perform the final multiplication.
30 x 11 = 330

The given expression has a value of 330, not 1.

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The first one.

Have faith in me, first one's the correct option that you're lookin for :)

Answer:

87°10''

Step-by-step explanation:

In 49°32'55'', we convert 32' to degrees. So. 32/60 = 8/15. We also convert 55'' to degrees. So, 55 × 1/60 × 1/60 = 55/3600 = 11/720

In 37°27'15'', we convert 27' to degrees. So. 27/60 = 9/20. We also convert 15'' to degrees. So, 15 × 1/60 × 1/60 = 15/3600 = 1/240

We now add the fractional parts plus the whole part of the angles together.

So,

49 + 8/15 + 11/720 + 37 + 9/20 + 1/240 = 49 + 37 + 8/15 + 9/20 + 11/720 + 1/240 = 86 + 59/60 + 7/360.

We now convert the fractional parts 59/60 to minutes by multiplying by 60 and convert 7/360 to seconds by multiplying by 3600

86° + 59/60 × 60 + 7/360 × 3600 = 86° + 59' + 7 × 10 =86° + 59' + 70'' = 86 + 59' +  1'  + 10''= 86 + 60' + 10'' = 86 + 1° + 10'' = 87° 10''

So, 49°32'55'' + 37°27'15'' = 87°10''

Option D is correct

Graph attached

Answer:

(x + 1)(x + 2) is divisible by 3.

Step-by-step explanation:

Assume that x is not divisible by 3. This means that x can be expressed as x = 3k + r, where k is an integer and r is the remainder when x is divided by 3. Since x is not divisible by 3, the remainder r must be either 1 or 2.

Case 1: r = 1

If r = 1, then x = 3k + 1. Now let's consider (x + 1)(x + 2):

(x + 1)(x + 2) = (3k + 1 + 1)(3k + 1 + 2)

= (3k + 2)(3k + 3)

= 3(3k^2 + 5k + 2)

We can see that (x + 1)(x + 2) is divisible by 3.

Case 2: r = 2

If r = 2, then x = 3k + 2. Now let's consider (x + 1)(x + 2):

(x + 1)(x + 2) = (3k + 2 + 1)(3k + 2 + 2)

= (3k + 3)(3k + 4)

= 3(3k^2 + 7k + 4)

We can see that (x + 1)(x + 2) is divisible by 3.

Hence, the statement is proven.

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Answer:

si a

Step-by-step explanation: