2. The population of chickadees in a certain region is smaller by 30% than the population of
phoebes, and the population of blue jays is 30% of the population of phoebes.
The population of phoebes is 12,000.
Find the sizes of the chickadee and blue jay populations in the region.

The range of set 1 is 11. The range of set 2 is  208

The wider range of set 2, set 2 contains a wider spread of the given data.

The range of the data is defined as the difference between the maximum value of data and the minimum value of the data.

The set is given in the question, as follows:

Set 1: 1, 4, 6, 8, 10, 12

The maximum value = 12

The minimum value = 1

The range of the set 1 = maximum value - minimum value

Substitute the values in the above formula,

The range of the  set 1  = 12 - 1

Apply the subtraction operation to get the answer

The range of the set 1 = 11

Set 2: 230, 24, 33, 22, 41

Now, the range of the  set 2  = 230 - 22 = 208

Data set 1 has a range of 11, whereas data set 2 has a range of 208.

Therefore, the wider range of set 2, set 2 contains a wider dispersion of data.

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Answer: [tex]x-75\geq 420[/tex]

Step-by-step explanation:

... as it say...

Answer:

x -75 ⩾ 420

Step-by-step explanation:

we take away 75 from the value of X and compare it to 420 using the greater than or equal sign.

Answer:

              Based on the measures of the following triangle's angles, the triangle can be classified as an obtuse triangle.

Step-by-step explanation:

              In order to decide which type of triangle this is, first we must understand what an acute, right, and obtuse triangle are. Acute triangles are triangles with all three of its angles less than 90°, right triangles are triangles with one angle that is exactly 90°, and obtuse triangles are triangles with one angle that is greater than 90°. Overall, we can determine the type of this triangle by looking at its angles.

             The given triangle has the angles 25°, 136°, and 19°. Now we can compare it to the rules above and see whether this triangle is acute, right, or obtuse. As the given triangle has an angle that is greater than 90°, we can conclude that the following triangle is an obtuse triangle.

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The mean, variance, and standard deviation of this sample is 377.5, 7007.5 meters^2 and 83.7 metres respectively. The 95% confidence interval for the true mean skidding distance is (340.5, 414.5) meters. we find that the p-value for a t-statistic of -3.61 is less than 0.01.

To calculate the mean, variance, and standard deviation of this sample, we can use the following formulas:

Using the formulas, we get:

Mean = (365 + 350 + 380 + 400 + 395 + 375 + 385 + 380 + 390 + 370 + 360 + 370 + 380 + 370 + 400 + 385 + 375 + 385 + 380 + 375) / 20

= 377.5 meters

Variance = [(365-377.5)^2 + (350-377.5)^2 + (380-377.5)^2 + ... + (380-377.5)^2 + (375-377.5)^2] / (20-1)

= 7007.5 meters^2

Standard deviation = square root of variance = sqrt(7007.5) = 83.7 meters

Therefore, the mean skidding distance is 377.5 meters, the variance is 7007.5 meters^2, and the standard deviation is 83.7 meters.

To estimate the true mean skidding distance of the road with a 95% confidence interval, we can use the following formula:

Confidence interval = sample mean ± (t-value * (standard deviation / sqrt(sample size)))

Here, the sample mean is 377.5 meters, the standard deviation is 83.7 meters, and the sample size is 20. To find the t-value, we need to look it up in a t-distribution table with 19 degrees of freedom. From the table, we find that the t-value for a 95% confidence interval is 2.093.

substituting the values, we get:

Confidence interval = 377.5 ± (2.093 * (83.7 / sqrt(20)))

= 377.5 ± 37.0

Therefore, the 95% confidence interval for the true mean skidding distance is (340.5, 414.5) meters.

The assumptions needed for this inference to be valid are:

The sample is a random sample from the population of skidding distances along the road.

The skidding distances follow a normal distribution in the population.

The sample size is large enough (at least 30) or the population standard deviation is known.

To check these assumptions, we can use a normal probability plot to check for normality and calculate the sample size to see if it is large enough. We can also use previous studies or expert knowledge to check if the assumption of normality is reasonable.

To test the logger's claim that the mean skidding distance is at least 425 meters, we can perform a one-sample t-test. The null hypothesis is that the mean skidding distance is 425 meters, and the alternative hypothesis is that it is less than 425 meters.

Using the formula for the t-statistic, we get:

t = (sample mean - hypothesized mean) / (standard deviation / sqrt(sample size))

= (377.5 - 425) / (83.7 / sqrt(20))

= -3.61

From a t-distribution table with 19 degrees of freedom, we find that the p-value for a t-statistic of -3.61 is less than 0.01. Therefore, we reject the null hypothesis and can conclude that there is not enough evidence to support the logger's claim. Therefore, we do not agree with the logger's claim.

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Serina is mistaken because Serina should have solved for x in the second equation because it has a coefficient of 1.

Serina is mistaken because solving for x in the first equation as her first step does not necessarily lead to the most efficient solution. While it is true that both 2 and 3 can be divided into 18, this approach may require additional steps to solve for the other variable, y, in the second equation.

In this case, it is actually more efficient to solve for x in the second equation because it has a coefficient of 1. This means that once we solve for x, we can substitute that value into the first equation and solve for y directly, without needing to perform any additional calculations.

Here's how we can solve the system of equations using this approach:

X + 7 y = 31 (solve for x)

x = 31 - 7y

Substitute x = 31 - 7y into the first equation:

2 x + 3 y = 18

2 (31 - 7y) + 3 y = 18

62 - 14 y + 3 y = 18

-11 y = -44

y = 4

Substitute y = 4 into the equation we used to solve for x:

x = 31 - 7y

x = 31 - 7(4)

x = 3

Therefore, the solution to the system of equations is x = 3, y = 4.

In summary, while it is important to consider which variable to solve for first when solving a system of equations, the most efficient approach may vary depending on the specific equations and coefficients involved. In this case, solving for x in the second equation was the most efficient approach.

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The complete question:

Evaluate the expression. 0.3 = -5 - (-0.4 - -0.6) Write your answer as an integer or a decimal. Do not round.​

Solution:

The value of the expression in a decimal form is, -17.33.

An expression is a sentence with at least two numbers or variables having mathematical operation. Maths operations can be addition, subtraction, multiplication, division.

For example, 2x+3

We have,

0.3x = -5 - (-0.4 - (-0.6))

0.3x = -5 - (-0.4 + 0.6)

0.3x = -5 - 0.2

0.3x = -5.2

x = -5.2/0.3

x = -17.33

Therefore, the value of x is -17.33.

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y-intercept(s): (0,−2)

Answer:

2

Step-by-step explanation:

The [tex]x^{2}[/tex] and x terms are made to follow the sequence:

[tex][a-b]^{2} =a^{2} -2ab + b^{2}[/tex]

Therefore the [tex]b^{2}[/tex] term has to be added to complete the [tex][a -b]^{2}[/tex] sequence, but at the same time the [tex]b^{2}[/tex] term has to be balanced as it is not originally present in the equation:

[tex]y = x^{2} - 3x + 2 = [(x)^{2} - 2(x)(\frac{3}{2}) + (\frac{3}{2})^{2}] + 2 - (\frac{3}{2})^{2}[/tex]

  [tex]= [x - \frac{3}{2}]^{2} + 2 - \frac{9}{4}[/tex]

  = [tex][x - \frac{3}{2}]^{2} + \frac{8}{4} - \frac{9}{4}[/tex]

  = [tex][x- \frac{3}{2}]^{2} \frac{+ 8-9}{4}[/tex]

  = [tex][x-\frac{3}{2}]^{2} -\frac{1}{4}[/tex]

y-intercept is the y-value obtained when x = 0 in the equation:

[tex]= [0 - \frac{3}{2}]^{2} -\frac{1}{4}[/tex]

= [tex](-\frac{3}{2})^{2} -\frac{1}{4}[/tex]

= [tex]\frac{9}{4} - \frac{1}{4}[/tex]

= [tex]\frac{8}{4}[/tex]

= 2

Answer:

The total number of boats Paul counted is 24 speed boats + 5 sail boats + 1 rowboat = 30 boats.

So, the experimental probability that the next boat he sees will be a sailboat is 5 sail boats / 30 boats = 1/6.

The experimental probability of an event is defined as the ratio of the number of times the event occurs to the total number of trials or observations.

In this case, Paul observed a total of 24 + 5 + 1 = 30 boats, of which 5 were sailboats.

Therefore, the experimental probability that the next boat Paul sees will be a sailboat is:

Experimental probability = number of sailboats / total number of boats

Experimental probability = 5 / 30

Experimental probability = 1/6

So the experimental probability of seeing a sailboat next is 1/6 or approximately 0.167.

A circle graph representing the data presented will show half of the students prefer apple juice; while grape, orange juice, and fruit punch are preferred by a lower ratio of students.

A circle graph also known as a pie graph is a visual representation of data based on a circle and its fractions of it. In this way, if 20 out of the 40 students prefer apple juice this means in the circle graph half of it would be for students preferring apple juice.

Based on this, a possible circle graph that represents the data is shown below:

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Answer: Given the ratio of boys to girls at the park is 4 to 5, then there are 4 boys for every 5 girls. If there are 45 girls at the park, then there are 4 * 45 / 5 = 36 boys at the park.

So, the answer is B) 36.

Step-by-step explanation:

The answers include the following:

This is referred to as a system of government where the citizens of a state exercise power to rule the state, either directly or through electing representatives.

Decisions take much longer because the people have a say in them through the process of voting and is therefore the reason why it was chosen as the correct  choice.

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Answer:

Step-by-step explanation:The form or system of government which gives the most power to the people of the nation is Democracy.

The new prime minister is part of the lawmaking branch and answers to it which means that the system of government is parliamentary.

When they wrote the Constitution, they gave more power to the central government. The states still have authority within their borders but must follow the Constitution and its laws which depicts Confederation.

“Decisions take much longer because the people have a say in them therefore the section of the chart which you would place this statement is Democracy.

Answer:

Step-by-step explanation:

First you identify your variable, for our sake lets use x:

x= number in question

Next you write the equation given in the question:

2(x-5)= x+25

Next you use the distributive property and multiply 2 by both x and negative 5 to get:

2x-10=x+25

Now you want to get all of the x's to one side so you subtract the x on the right, fro the one on the left giving you:

x-10=25

Then you simply add 10 to 25 giving you the answer of x=35

Answer:

t = 21 + (-4)h

Step-by-step explanation:

t = temp. at hour h

h = # of hours past midnight

t = 21° + (-4°/hr)h

The factors of given polynomial are (x+3), (x-3), (x+2) and (x-2).

The factors are the polynomials which are multiplied to produce the original polynomial.

The given polynomial is x⁴-13x²+36

Here, x⁴-13x²+36 can be written as x⁴-9x²-4x²+36

= x²(x²-9)-4(x²-9)

= (x²-9)(x²-4)

= (x²-3²)(x²-2²)

By using the identity a²-b²=(a+b)(a-b)

So, (x+3)(x-3)(x+2)(x-2)

Therefore, the factors are (x+3), (x-3), (x+2) and (x-2).

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Answer: 4x = 64 or -32/-2

Step-by-step explanation:

you could multiply both sides by 2.

4x = 64

4x/4 = 64/4

x = 16

OR

-2x or -32 to both sides

-32 = -2x

divide both sides by -2

x = -32/-2

x = 16

hope this helps

Answer:

Below

Step-by-step explanation:

It has two sides that are parallel  ( the 'bases' )  and different lengths ( making the other two sides NOT parallel)

Answer:

Step-by-step explanation:

A trapezoid is a quadrilateral with at least one pair of parallel sides. In other words, a trapezoid has two opposite sides that are parallel, called the bases, and the other two sides are called the legs or lateral sides.

So, to conclude that a quadrilateral is a trapezoid, you must determine that:

1)Two of its sides are parallel.

2)The other two sides are not parallel.

If these two conditions are met, then the quadrilateral is a trapezoid.

(If a trapezoid has two pairs of parallel sides, then it is known as a parallelogram, which is a special type of trapezoid.)

Oliver's number is bigger than that of Chen.

It is a number equal to 10 times 10.

Given is that Oliver and Chen both write down a number. Oliver says, my number has 8 hundreds and Chen's number only has 3 hundreds, my number must be bigger.

Oliver number can be written as follows -

8 x 10 x 10

Chens number can be written as follows -

3 x 10 x 10

It can be concluded that Oliver's number is bigger than that of Chen.

Therefore, Oliver's number is bigger than that of Chen.

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domain = all real numbers

range = y > -2

y=x²-2

range is y is -2

domain is x is

Answer:

E is a major arc

C is a minor sector

A is a major segment

Major segment is the portion (or part) of the circular region enclosed between a chord and the corresponding major arc.

Major arc is the longer arc connecting two endpoints on a circle.

A sector with a central angle less than 180° is called a minor sector.

Answer:

Step-by-step explanation:

Area of a rectangle = length times width.

Area of the garden = 6z(4z + 17)

24z² + 102z

Answer:

3

Step-by-step explanation:

In this triangle ABC, the leg lengths are AC and BC, being x and x+7, respectively. So, the area can be listed as: 15 = (1/2) * x * (x+7). Simplifying that gets x^2 + 7x = 30 -> x^2 + 7x - 30 = (x-10)(x-3). So, x = 3 since it cannot be negative.

Answer:

undefined or no slope.

Step-by-step explanation:

m is slope. slope is always change of y over change of x. this mean. y2-y1 divide by x2-x1. in this case y2 is -8, y1 is 5 and x2 is 6 and x1 is 6. remember the number in front the variable are base. the answer is undefined.

The change in potential energy of the apple during the fall was approximately 13.72 joules.

One of the two types of energy is potential energy, which is the latent energy in an object at rest. Kinetic energy, on the other hand, is the energy that an item in motion expresses.

The formula: can be used to determine the change in potential energy (PE) of a mass m object that falls a distance h from the Earth's surface.

ΔPE = mgh

where g is the acceleration brought on by gravity close to Earth's surface, which is roughly 9.8 m/s^2.

In this instance, the apple weighs 0.2 kg, falls 7 metres, and accelerates by gravity at a rate of 9.8 m/s^2. So, the potential energy change is as follows:

PE is equal to (0.2 kg) times (9.8 m/s^2) times (7 m) Equals 13.72 joules (J)

As a result, the apple's potential energy changed by around 13.72 joules during the fall.

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The solution is:  (A) y+4=-3(x+6), is the equation of the line in point-slope form.

In mathematics, the slope or gradient of a line is a number that describes both the direction and the steepness of the line. The slope of a line is a measure of its steepness. Mathematically, slope is calculated as "rise over run" (change in y divided by change in x).

here, we have,

The point-slope form of the equation of a line whose slope is m and passes through the point (x1,y1) is:

y-y1 = m (x-x1)

Given the point:

(x1,y1) = (-6, -4)

Slope, m= -3

x1 = -6,

y1 =-4

Substituting these values into: y-y1 = m (x-x1) , we obtain the point slope form of the equation:

we get,

y+4=-3(x+6)

The correct option is A.

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complete question:

The graph of a line has a slope of -3 and passes through the point (-6,-4).

What is the equation of the line in point-slope form?

Oy + 4 = -3(x + 6)

y + 6 = -3(x + 4)

y-4 = -3(x-6)

y-6 = -3(x – 4)

(a) Randomized experiment, (b) There are three criteria for a randomized experiment

a) This is a randomized experiment.

b) The three criteria for a randomized experiment are:

Random assignment, the children were randomly assigned to the xylitol or placebo group.

Control group, a placebo group was used as a control.

Manipulation, the children were given different forms and doses of xylitol or placebo.

c) The explanatory variable is the form and dose of xylitol or placebo given to the children. The response variable is the incidence of ear infections.

d) Diagram of the randomized comparative experiment:

Population of healthy children in daycare centers

↓

Random assignment to xylitol or placebo group

↓

Intervention group: given xylitol in syrup, gum or lozenge form

Control group: given a placebo in gum, syrup or lozenge form

↓

Comparison of incidence of ear infections in intervention and control groups

↓

Analysis of results to determine the effectiveness of xylitol in reducing ear infections.

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The measure of ∠B of the right angle is 152°

A triangle is a plane figure or polygon with three sides and three angles.

A Triangle has three vertices and the sum of the interior angles add up to 180°

Let the Triangle be ΔABC , such that

∠A + ∠B + ∠C = 180°

The area of the triangle = ( 1/2 ) x Length x Base

For a right angle triangle

From the Pythagoras Theorem , The hypotenuse² = base² + height²

if a² + b² = c² , it is a right triangle

if a² + b² < c² , it is an obtuse triangle

if a² + b² > c² , it is an acute triangle

Given data ,

Let the triangle be represented as ABC

Now , the measure of ∠A = 2x - 8

The measure of ∠B = 3x + 5

And , angle A and angle B make a right angle

On simplifying the equation , we get

2x - 8 = 90

Adding 8 on both sides of the equation , we get

2x = 98

Divide by 2 on both sides of the equation , we get

x = 49

Substitute the value of x in equation , we get

∠B = 3 ( 49 ) + 5

The measure of ∠B = 152°

Hence , the angle is ∠B = 152°

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The distance the ladder goes up the wall is approximately 12.14 meters.

Trigonometry is a branch of mathematics concerned with relationships between angles and ratios of lengths.

We can use trigonometry to solve this problem.

Let's call the distance the ladder goes up the wall "d". We can use the angle the ladder makes with the horizontal to find the length of the ladder that is leaning against the wall.

We know that the ladder is 15.5 m long, so we can use the sine function to find the length of the ladder that is leaning against the wall:

sin(53° 25') = d/15.5

We can solve for "d" by multiplying both sides by 15.5:

d = 15.5 * sin(53° 25')

Using a calculator, we get:

d ≈ 12.14 m

Therefore, the distance the ladder goes up the wall is approximately 12.14 meters.

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In the triangle, the nearest whole number of the side t is 28.

The sine rule states that the ratios of the sides to their corresponding opposite angles are equal to a particular value. This value gives the circumradius of that triangle.

The sum of three angles in a triangle is 180°.

Find the angle ∠T for ∠A=46° and ∠D=84°.

∠A+∠D+∠T=180°

46°+84°+∠T=180°

130°+∠T=180°

∠T=50°

The sine rule for triangle ABC is [tex]\[\frac{a}{{\sin A }} = \frac{{37}}{{\sin B }} = \frac{c}{{\sin C }} = 2R\][/tex], where R is the circumradius and a, b, and c are the opposite sides of the angles ∠A, ∠B, and ∠C, respectively.

On applying the sine rule to triangle ADT, the result becomes [tex]\[\frac{a}{{\sin 46^\circ }} = \frac{{37}}{{\sin 84^\circ }} = \frac{t}{{\sin 50^\circ }} = 2R\][/tex].

Take the equation [tex]\frac{{37}}{{\sin 84^\circ }} = \frac{t}{{\sin 50^\circ }}[/tex] and find t.

[tex]\[\begin{array}{l}t = \frac{{37\sin 50^\circ }}{{\sin 84^\circ }}\\ \approx 28.4997\\ \approx 28\end{array}\][/tex]

Therefore, the nearest round whole number of t is 28.

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The amount of interest paid will be $9.6.

The simple interest is the simple amount paid by the borrower to the bank according to the percentage set by the bank for per year which is a fixed interest rate.

Given that Margo takes out a $600 loan with a 10-month repayment period and a 2% yearly interest rate.

The simple interest will be calculated as:-

SI = ( P x R x T ) / 100

SI = ( 600 x 2 x 0.8 ) / 100

SI = 960 / 100

SI = $9.6

Therefore, $9.6 will be paid in interest.

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