need help with 1 and 2

Answer:

Factor 3x+3

3x+3

=3(x+1)

Answer:

P=2[9x-3]

Step-by-step explanation:

perimeter of rectangle =2(L+W)=2L+2W

where P=perimeter of rectangle

L=length of rectangle =3x+3

W=width of rectangle =6x-6

P=2[(3x+3)+(6x-6)]

P=2[3x+3+6x-6]

P=2[9x-3]

Answer: 15.40205

Step-by-step explanation:

The expression "cos 80° ÷ sin 10°" can be evaluated using the reciprocal identity of sine and cosine.

First, we convert 80° to its radian equivalent: 80° x (π/180°) = 4π/9 radians.

Next, we use the reciprocal identity of sine and cosine:

cos (θ) ÷ sin (θ) = cot (θ)

So,

cos 80° ÷ sin 10° = cot (10°).

The value of cot (10°) can be found using a calculator or a table of trigonometric values. The exact value is approximately 15.40205.

The value of a in the triangle is 17 degrees

An equilateral triangle is that type of triangle whose all sides and all angles are equal.  Recall theat the sum of angles of a triangle is 10 degrees.

This implies that

4a-8 +4a-8 +4a-8 = 180

12a -24 = 180

12a = 180+24

12a = 204

Making a the subject of the relation,

12a/12 = 204/12

Therefore the value of a= 17⁰

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A statistic is an estimate or calculation based on a sample size of data, while a parameter is a numerical characteristic of an entire population.

A statistic is a value or set of values which are calculated from a sample of data. Statistic values are used to measure attributes of a population, such as the mean, median, or mode of a population. Statistic values are estimates and can be subject to sampling error. Parameters, on the other hand, are numerical characteristics of an entire population. Parameters are fixed values which describe the population as a whole. For example, thirty percent of all dog owners might be a statistic, as it is an estimate based on a sample of data. However, the total number of dog owners would be a parameter, as it describes the entire population of dog owners. Parameters are not subject to sampling error, and they cannot be calculated from a sample set of data.

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The value of x in the given equation -3x+2=4x+2 is x=0.

Two or more expressions with an Equal sign is called as Equation.

The given equation is -3x+2=4x+2

Minus three times of x plus two equal to four times of x plus two.

-3x+2=4x+2

Add 3x on both the sides

2=4x+3x+2

x=0

Hence, the value of x in the given equation -3x+2=4x+2 is x=0.

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[tex]17\frac{1}{2}[/tex] cups of flour we need to make three of each cake.

A fraction represents a part of a whole.

Given that the first recipe calls for 2 1/2 cups of flour and the second one calls for 3 1/3 cups of flour.

We need to make three of each cakes.

[tex]2\frac{1}{2}[/tex] cups x 3 = [tex]7\frac{1}{2}[/tex] cups of flour for the first recipe.

And for the second recipe [tex]3\frac{1}{3}[/tex] cups x 3 = 10 cups of flour.

So in total  [tex]7\frac{1}{2}[/tex]  cups + 10 cups = [tex]17\frac{1}{2}[/tex] cups of flour.

Hence,  [tex]17\frac{1}{2}[/tex] cups of flour we need to make three of each cake.

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The simplification of the fractions gives 4 / (b - d).

Fractions are numbers which are of the form a/b where a and b are real numbers. This implies that a parts of a number b.

Here, a is called the numerator and b is called the denominator.

Given expression is [tex]\frac{8a + 4b}{2ab+b^2-2ad-bd}[/tex].

We have to simplify each of the numerator and denominator in the expression [tex]\frac{8a + 4b}{2ab+b^2-2ad-bd}[/tex].

Take the common factor in each of the expressions in numerator and denominator.

8a + 4b = 4(2a + b)

2ab + b² - 2ad - bd = 2ab - 2ad + b² - bd

                               = 2a(b - d) + b(b - d)

                               = (b - d) (2a + b)

[tex]\frac{8a + 4b}{2ab+b^2-2ad-bd}[/tex] = [tex]\frac{4(2a+b)}{(b-d)(2a+b)}[/tex]

                     = [tex]\frac{4}{b-d}[/tex]

Hence the simplified expression is 4 / (b - d).

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The median of this data set is 30. If the largest observation (50) were deleted, the median would become 25, which is a 5 unit change.

Here's a data set with five observations for which the median would change significantly if the largest observation were deleted:

Observation 1: 20

Observation 2: 25

Observation 3: 30

Observation 4: 35

Observation 5: 50

The median of this data set is 30. If the largest observation (50) were deleted, the median would become 25, which is a 5 unit change. This is a significant change because the median is a measure of central tendency that shows the midpoint of a set of data and is sensitive to outliers. By removing the largest observation, the data set is no longer skewed towards larger values, and the median changes to reflect this.

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Answer:

a. Congruent

Step-by-step explanation:

ABCD has the same dimensions of A'B'C'D', so that means that it is congruent, even though it's in a different place on the graph.

The equation [tex]\frac{x}{x+8} = -\frac{1}{6}[/tex] is not defined at x = - 8.

Suppose we have an ordered pair (x, y) then the domain of the function is the set of values of x and the range is the set of values of y for which x  is defined.

Given, An equation [tex]\frac{x}{x+8} = -\frac{1}{6}[/tex].

We know the denominator of a rational expression can not be equal to zero.

Therefore, x + 8 ≠ 0 ⇒ x ≠ - 8.

So, The restriction of the expression is at - 8 and it is undefined at - 8.

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The measure of the angle m∠BDE obtained using the exterior angles theorem is 86°. The correct option is therefore;

86°

The exterior angle theorem states that the angle formed by two secants, a secant and a tangent or two tangents of a circle is equivalent to the half of the difference of the arcs intercepted.

The specified interior angle of the triangle ΔOBJ, ∠J = 47°

The segments OJ and BO are radial lengths of the circle, therefore;

JO ≅ BO

JO = BO (definition of congruency)

The triangle ΔOBJ is an isosceles triangle (definition of isosceles triangles)

∠J ≅ ∠B (Base angles of an isosceles triangle)

∠B = ∠J = 47°

m∠BOJ = 180°- 47° - 47° = 86° (angle sum property of a triangle)

Whereby EJ is a diameter of the circle, with center at O, we get;

∠BOJ and ∠BOE are linear pair angles, therefore;

m∠BOJ + m∠BOE = 180° (Linear pair angles are supplementary)

m∠BOE = 180° - m∠BOJ

m∠BOE = 180° - 86° = 94°

The exterior angle theorem indicates that we get;

m∠BDE = Half the difference of the intercepted arcs BJE and BE, found as follows;

[tex]m\widehat{BE}[/tex] = m∠BOE = 94°

[tex]m\widehat{BJE}[/tex] = 360° - m∠BOE = 360° - 94° = 266°

[tex]m\widehat{BJE}[/tex] = 266°

m∠BDE = ([tex]m\widehat{BJE}[/tex] - [tex]m\widehat{BE}[/tex])/2

m∠BDE = (266° - 94°)/2 = 86°

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Answer:154 LCM I hope this helps mark me brainlist

Step-by-step explanation:

The Least Common Multiple (LCM) of 22 and 77 is 154.

To get the Least Common Multiple (LCM) of 22 and 77 we need to factor each value first and then we choose all the factors which appear in any column and multiply them: 

22: 2 11

77: 7 11

______
LCM 2711

The Least Common Multiple (LCM) is: 
2 times 7 times 7=154

Answer: Yes, it is congruent.

Rt is same length as Tu

angle rst is equal to angle tvu

therefore the angle where they both meet would have to be the same aswell, so it is congruent

Step-by-step explanation:

Answe is attached in the above image.

The statement that correctly describes whether this is a theory or a law is C. It is a theory, because it explains the cause of the dinosaur extinction.

A law is a statement that describes a general observation or a relationship that has been consistently proven through experimentation and evidence.  A theory, on the other hand, is a more comprehensive explanation that helps to understand a wide range of observations and experimental results.

The excerpt spoke on how a meteorite hitting Earth led to the extinction of the dinosaurs. However, this is not a law as it aims to explain why dinosaurs died out.

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The full question is:

A meteorite hit Earth sixty five million years ago​. Scientists have found a high concentration of iridium in the sedimentary clay layer from this time period. Iridium is very rare in Earth’s crust, but it is abundant in meteorites. Scientists believe this impact caused the extinction of the dinosaurs. Which of these statements correctly describes whether this is a theory or a law and why?

A. It is a law, because it includes a numerical analysis.

B. It is a law, because it explains all causes of animal extinction.

C. It is a theory, because it explains the cause of the dinosaur extinction.

D. It is a theory, because it shows regular patterns from a generalization of the data.

Answer:

Below

Step-by-step explanation:

a vertical line is just  X = ......

So for this one through the point  7,-7     just      x = 7

The function will be positive and increasing for all values of x.

The formula for an exponential function is f (x) = aˣ, where x is a variable and a is a constant that serves as the function's base and must be bigger than 0. The transcendental number e, or roughly 2.71828, is the most often used exponential function basis.

Given the function,

y = 7(5)ˣ

when x = 0, y = 7

x = -1, y = 1.4

x = 1, y = 35

an exponential function is,

y = abˣ

when a > 0 and b > 0 the function is an exponential growth function, for all values of x.

Hence the function will be positive and increasing.

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The function y = 7(5)ˣ is positive and increasing,

Exponential function, in mathematics, a relation of the form y = [tex]a^x[/tex], with the independent variable x ranging over the entire real number line as the exponent of a positive number a.

Given:

y = 7(5)ˣ

As, Exponential functions have the general form:  y = aˣ, where a>0

and a is called the base of the exponential function and x is any real number.

If the base a> 1 and has positive exponent(i.e. x>0) then the exponential function is increasing.

If the base 0 < a< 1 and has negative power then the function is decreasing.

Thus, the function y = 7(5)ˣ is increasing.

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the value of a will be 17 for the given set of data.

The properties of the triangle are: The sum of all the angles of a triangle (of all types) is equal to 180°. The sum of the length of the two sides of a triangle is greater than the length of the third side. In the same way, the difference between the two sides of a triangle is less than the length of the third side.

Given, KLH is an equilateral triangle.

Since we all know that all angles of an equilateral triangle are equal.

Also From the property of  the triangles:

Sum of all angles = 180°

∠K + ∠L + ∠H = 180°

3 * (4a -8) = 180

4a -8 = 60

4a = 68

a = 17

Therefore, the value of a will be 17 for the given set of data.

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The measure of the smallest angle of the triangle would be = 33°

The total angle measurement of a triangle is a total of 180°.

That is ;

180° = 90 + (4x-7)° + (3x-15)°

180 = 90-7-15+4x+3x

180 = 90-22+7x

180 = 68+7x

180-68 = 7x

7x = 112

X= 112/7

X= 16

substitute X=16 into both angles (4x-7)° and (3x-15)° to know the smallest.

= 4(16)-7

= 64-7

= 57°

and;

= 3(16)-15

= 48-15

= 33°

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The formula for population variance uses the division of (sum of squared deviations) by the total number of elements in the population, while the formula for sample variance uses the division of (sum of squared deviations) by the sample size minus one.

The formula for population variance uses the division of (sum of squared deviations) by the total number of elements in the population, while the formula for sample variance uses the division of (sum of squared deviations) by the sample size minus one.

The formula for population variance is given by:

σ² = (1/N) * ∑(X - μ)²,

where N is the total number of elements in the population, X is an individual value in the population, and μ is the mean of the population.

s²= (1/(n-1)) * ∑(X - m)²,

where n is the sample size and m is the mean of the sample.

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the test-taker made a score of 16 points on the test.

16 points

8 questions x 2 points per question = 16 points

The test consisted of 17 questions, each worth two points. By answering 8 of them correctly, the test-taker was able to earn 16 points. This score was acquired by multiplying the number of correct questions by the two points per question. Therefore, the test-taker made a score of 16 points on the test.

The test consisted of 17 multiple-choice questions, each worth two points. Each question contained four possible answers, one of which was the correct answer. By selecting the correct answer to 8 questions, the test-taker earned a total of 16 points. This score was calculated by multiplying the number of correct questions by the two points per question. Therefore, the test-taker achieved a score of 16 points on the test.

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Answer: a. The rate of change in this situation represents the average number of pages read per minute. From the table, it can be seen that the rate of change is constant, as the ratio of the change in y (pages) to the change in x (minutes) is always the same.

For example, when x increases from 0 to 5, y increases from 0 to 25, so the rate of change is 25/5 = 5 pages per minute.

b. To represent the total number of pages as it relates to the number of minutes read, a linear equation can be used. The slope of the line represents the rate of change, and the y-intercept represents the number of pages read when x is equal to 0 (minutes).

Using the rate of change from the above example (5 pages per minute), the equation can be written as y = 5x + 0, where x represents the number of minutes and y represents the total number of pages read.

Step-by-step explanation:

The probability that a randomly selected Atlantic cod has a length of 53.68 cm or less is given by the equation P ( x > 38.68 ) = 0.99865

The relationship between a value and the mean of a set of values is expressed numerically by a Z-score. The Z-score is computed using the standard deviations from the mean. A Z-score of zero indicates that the data point's score and the mean score are identical.

The Z-score is calculated using the formula:

z = (x - μ)/σ

where z: standard score

x: observed value

μ: mean of the sample

σ: standard deviation of the sample

Given data ,

Let the probability that a randomly selected Atlantic cod has a length of 53.68 cm or less be represented as P

Now , the equation will be

The observed value of x = 38.68 cm

The mean of the sample μ = 49.9 cm

The standard deviation of the sample σ = 3.74 cm

Now , z-score is calculated using the formula:

z = (x - μ)/σ

Substituting the values in the equation , we get

z = ( 38.68 - 49.9 ) / 3.74

z = -3

Now ,the p value from the z table is

P ( x > 38.68 ) = 1 - P ( x < 38.68 )

P ( x < 38.68 ) = 0.0013499

P ( x > 38.68 ) = 0.99865

And , the probability is P ( x > 38.68 ) = 0.99865 = 99.865 %

Hence , the probability is 84.392 %

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Answer:

The rate at which the turtle is crawling can be found by dividing the distance traveled in miles by the time in hours.

So, the turtle can travel 3/20 of a mile in 5/6 of an hour, which means that the turtle is crawling at a rate of (3/20) / (5/6) miles per hour.

To simplify, we need to convert both the numerator and denominator to a common unit. If we multiply the numerator and denominator by 6, we get:

(3/20) * 6 / (5/6) * 6 = 3 / 5 miles per hour.

Therefore, the turtle is crawling at a rate of 3/5 miles per hour.

Answer:

1723.9 mb

Step-by-step explanation:

Essentially, the question is asking "281 is 16.3% of what number.

Thus, we can find the percentage of a number using the formula

[tex]Px=y[/tex], where P is the percentage.  In context of the question, x is how many megabytes have already downloaded and y is 281.

We simply need to solve for x and round to the nearest:

[tex]\frac{16.3}{100}x=281\\ \\0.163x=281\\x=1723.92638=1723.9[/tex]

The p-value of the test is 0.112

To determine whether the consumer group's belief is supported by the sample data, we can perform a one-sample t-test.

The null hypothesis is that the true average score improvement is equal to 50 points, while the alternative hypothesis is that it is less than 50 points.

Using the sample data, we can calculate the t-statistic as:

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

t = (44 - 50) / (27 / √(31))

t = -1.24

The degrees of freedom for this test is 30 (sample size minus one).

Using a t-distribution table or calculator, we can find the p-value associated with this t-statistic and degrees of freedom, which is the probability of observing a t-statistic as extreme as -1.24 or more extreme, assuming that the null hypothesis is true.

The p-value is approximately 0.112.

Since the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that there is evidence that the true average score improvement is less than 50 points.

Therefore, the consumer group's belief is supported by the sample data.

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Answer:

Below

Step-by-step explanation:

The two angles labeled are alternate angles of a pair of parallel lines crossed by a transversal ( the diagonal) ....so they are equal

x+ 18 = 4x+15    Solve for x

3 = 3x   ====>    x = 1    

Now....x+18  angle and angle ABD are complementary....the add to 90 °

   so   x+18    + ABD   = 90°        x = 1 from above....so

            1 + 18 + ABD = 90

               19  + ABD = 90

                        ABD = 71 °

Note that the system of linear inequalities that match the graph is: Option D  . -x + y ≤ 2; x + y ≤ 2; x + y < 2-

A system of linear inequalities is similar to a system of linear equations, except that it is made up of inequalities rather than equations. To represent scenarios with various restrictions, systems of linear inequalities are utilized.

A system of linear equations is a group of two or more linear equations that include the same variables in mathematics. Linear equations are defined as first-order equations when the maximum power of the variable is 1. One, two, or three variables can be used in linear equations.

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Answer:

12

Step-by-step explanation:

there are 7 days in a week so just simply divide 84 by 7 :)

Answer:

two plus two equals five

Step-by-step explanation:

Answer:

24

Step-by-step explanation:

The rate of change over a function f(x) is given by its first derivative
[tex]f'(x) = \dfrac{d}{dx} (f(x))[/tex]

[tex]\mathrm{Differentiating\; f(x) = 3x^2- 5 \;w.r.t \;x : }[/tex]

[tex]\dfrac{d}{dx}\left(3x^2-5\right) = \dfrac{d}{dx}\left(3x^2\right)-\dfrac{d}{dx}\left(5\right)\\\\= 6x - 0\\\\= 6x\\\\[/tex]

[tex]f'(x) = 6x\\\\[/tex]

Over the interval [2, 6] the average rate of change would be  [tex]f'(6) - f'(2)[/tex]
[tex]f'(6) = 6 \cdot 6 = 36\\\\f'(2) = 6\cdot 2 = 12\\\\f'(6) - f'(2) = 36 - 12 = 24\\\\[/tex]

Average rate of change of the function f(x)=3x²-5 over the interval [2,6]

= 24