help with this please.

​

The value of the expression when a = 5 and b = -3 is 35. We can calculate it in the following manner.

We can simplify the expression as follows:

2a² + b²+ 1 - a²

= a² + b² + 1

Substituting a = 5 and b = -3 into the expression, we get:

5² + (-3)² + 1

= 25 + 9 + 1

= 35

Therefore, the value of the expression when a = 5 and b = -3 is 35.

When a variable (or set of letters) in an algebraic statement is substituted, its numerical value is used instead. The expression's total value can then be calculated. Formulas can be changed with values to assist us solve a variety of problems.

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Answer:

121

Step-by-step explanation:

11x11=121

121+11=132

132-11=121

Answer: 18x(8x+1)

Step-by-step explanation:

72x^2 + 72x^2+ 18x

144x^2+18x

72x^2 + 72x^2+ 18x

18(8x^2+x)

18(8x^2+x)

18x(8x+1)

hopes this helps!

Answer:

standard to vertex form : s*v

In a regular algebra class, completing the square is a very useful tool or method to convert the quadratic equation of the form [tex]y = a {x^2} + bx + c y = ax2 + bx + c[/tex] also known as the “standard form”, into the form [tex]y = a [ (x - h)^2] + k y = a(x - h)2 + k[/tex] which is known as the vertex form.

a. Discrete variable b. Continuous variable c. Continuous variable d. Discrete variable e. Continuous variable f. Continuous variable

In statistics, a variable is an attribute or characteristic that can be measured. They can be classified as either continuous or discrete. A continuous variable has values that can take any value within a given range while a discrete variable has values that can only be integers.

Classification of each variable:

a. The number of words spelled correctly by a student on a spelling test- Discrete variable

b. The amount of water flowing through the hoover dam in a day- Continuous variable

c. The length of time an employee is late for work- Continuous variable

d. The number of bacteria in a particular cubic centimeter of drinking water- Discrete variable

e. The amount of carbon monoxide produced per gallon of unleaded gas- Continuous variable

f. Your weight- Continuous variable

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Answer:

20 days

Step-by-step explanation:

To find the total time, we will just add up the days.

4 + 3 + 6 + 7 = 20 days.

Answer:

  (d)  not possible to tell from information given

Step-by-step explanation:

You want to know the total completion time for a project with four activities that take 4, 3, 6, and 7 days.

The project completion time will be determined by the dependencies between activities.

If each activity must be completed before the next, then the total time will be 4+3+6+7 = 20 days.

If there are no dependencies and all activities can be done in parallel, then the total completion time is 7 days, the time required for the longest activity.

In short, it is not possible to determine the total time from the information given.

a) No, there aren't shared rays.

b) Yes.

C) Vertical angles.

d) 2x = 50 + 8

e) x = 29.

Yes, clearly the two angles only share the common vertex which is B, all the rays startat that point, and in this case the rays for ABC are BA and BC.

Whie the rays for DBC are BD and BC.

So no, there aren't shared rays.

b) Yes, when the angles only share the vertex, these are called opposite or vertical angles, and it means that the two angles have the same measure.

c) As we said above, vertical angles.

d) The measures must be equal, then.

2x - 8 = 50

e) Solving that for x we will get:

2x = 50 + 8

2x = 58

x = 58/2 = 29

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A large retail company has different stores in the United States and in Europe.

a) i) Sampling method 2, results in a stratified sample of employees and strata is US And Europe.

ii) Sampling method 1, results in a Cluster sample of employees and Clusters: 8 (Employees of each 8 Stores).

b) Advantage and disadvantage of sampling method l is provided below.

c) Accurate Sampling, is statistical advantage of using sampling method 2 over a simple random sample.

We have the following information about problem :

1) In United States company and Europe company have 500 and 300 stores and a total of 100000, 60000 employees respectively (200 per store).

2) benefits offered by company are 1) One additinal day of paid vacation per year 2) Small increase in salary. Company wants to Know which offer is preferred and does employees in US And in Europe has difference of preference.

Now A)

i) Stratified sample of employees

Because in stratified sampling technique researcher identifies the contrubution of each strata in overall population. As in this case company chose 1000 employees out of100000 employees from US And 600 employees out of 60000 from Europe. Dividing them in 2 strata depending on there contribution in the over all population.

ii) Cluster sample of employees

Because in cluster sampling researcher divides sample in different groups (clusters) then researcher choose groups randomly for data analysis. groups get equal chance to be represented. In this example 8 stores (clusters) choosen randomly for study.

B) Sampling method 1 : Statistical advantage:

Accurate sampling is not guaranteed as proper representation of different groups in the population depending upon there representation is not practiced.

C) Statical advantage of sampling method 2 over simple random sample. In Sampling method 2 (Stratified sampling) Researcher identifies the contribution of each starata in population then picks the appropiriate sample size. Thus the most important advantage of method 2 over simple random sample is Accurate Sampling (attribution of each strata is properly represented in the sample chosen from the population).

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As per the travelling distance, if they meet in hours, then the rate of each cyclist is r₂ miles per hour.

Let's assume that the two towns are A and B, and the distance between them is d miles. Let the first cyclist start from town A and travel towards town B, and the second cyclist start from town B and travel towards town A. Let's also assume that the first cyclist travels at a rate of r₁ miles per hour, and the second cyclist travels at a rate of r₂ miles per hour.

Now, let's consider the time it takes for the two cyclists to meet. Since they are traveling towards each other, their combined speed is (r₁ + r₂) miles per hour. We can use the formula:

distance = speed × time

to find the time it takes for them to meet. Let t be the time taken for them to meet, then we can write:

d = (r₁ + r₂) × t

where d is the distance between the two towns.

Now, we need to solve for r₁ and r₂. We can use the fact that the two cyclists meet in hours to write:

t = d / (r₁ + r₂)

Substituting this expression for t in the equation we got earlier, we get:

d = (r₁ + r₂) × (d / (r₁ + r₂))

Simplifying this equation, we get:

r₁ + r₂ = d / t

Substituting the value of t, we get:

r₁ + r₂ = d / (d / (r₁ + r₂))

r₁ + r₂ = (r₁ + r₂)

This equation tells us that the sum of the rates of the two cyclists is equal to the distance between the two towns divided by the time it takes for them to meet.

We can now use algebra to solve for r₁ and r₂. Let's assume that r₁ is the faster cyclist, then we have:

r₁ = (d / t) - r₂

Substituting the value of t, we get:

r₁ = (d / (d / (r₁ + r₂))) - r₂

Simplifying this equation, we get:

r₁ = (r₁ + r₂) - r₂

r₁ = r₁

This equation tells us that the rate of the faster cyclist is equal to itself, which is obvious.

Now, we can find the rate of the slower cyclist by using the fact that:

r₂ = (d / t) - r₁

Substituting the value of t, we get:

r₂ = (d / (d / (r₁ + r₂))) - r₁

Simplifying this equation, we get:

r₂ = (r₁ + r₂) - r₁

r₂ = r₂

This equation tells us that the rate of the slower cyclist is also equal to itself, which is obvious.

Therefore, we can conclude that the rate of the faster cyclist is r₁ miles per hour, and the rate of the slower cyclist is r₂ miles per hour, where:

r₁ = (d / t) - r₂

r₂ = (d / t) - r₁

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The critical value that corresponds to a 90% confidence level is 1.645.

When we are given a confidence level, we can use a confidence interval to calculate the margin of error, and with that we can find the critical value. The critical value is the value that represents the number of standard deviations we need to go from the mean to capture a certain proportion of the distribution.

For example, for a 95% confidence level, we want to capture 95% of the distribution, so we need to go 1.96 standard deviations from the mean.To find the critical value that corresponds to a given confidence level, we need to use a table of critical values for the standard normal distribution. This table tells us how many standard deviations we need to go from the mean to capture a certain proportion of the distribution.

For example, the critical value for a 95% confidence level is 1.96, while the critical value for a 99% confidence level is 2.58. So, if we are given a confidence level of 90%, we need to find the critical value that corresponds to capturing 90% of the distribution.Using the table of critical values, we find that the critical value for a 90% confidence level is 1.645.

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Step-by-step explanation:

Semir = n

Sarah = 2n - 5

Sarah's expression =. 2n-5

Sarah's equation = 18(2n-5)

Semir's equation = 18(2n-5) = 450

n = 15

Sarah walked 2(15) - 5 which is 25 miles.

SungSo:

18x + 72 = 450

x = 21

Answer:

1. A - [tex]y\leq \frac{3}{2} x+3[/tex]

2. D - (1,5)

Step-by-step explanation:

The equation [tex]y\leq \frac{3}{2} x+3[/tex] fits this graph.

y has to be less than x due to the shaded part of the graph being on the underside of the line

To confirm this we can plug in a value to see if the inequality is true

I will use the origin as an example:

[tex]0\leq \frac{3}{2} (0)+3[/tex]

[tex]0\leq 3[/tex]

This inequality is true meaning this point is in the shaded region of the graph

Also the equation has to have an equal to because it has a solid line and not a dotted line

The point that isn't a solution is (1,5) due to the fact it isn't in the shaded region and when plugged into the equation gives a false inequality

[tex]5\leq \frac{3}{2} (1)+3[/tex]

[tex]5\leq \frac{3}{2}+3[/tex]

[tex]\frac{10}{2} \leq \frac{9}{2}[/tex]

This inequality is false which means the point (1,5) isn't a solution to this equation.

Answer:

1.) A

2.) D

Step-by-step explanation:

1.) find equation of line:

    b=3,   m=1.5

y=1.5x+3

shaded is below therefore

y[tex]\leq[/tex]1.5x+3

*line under inequality because line is solid

2.) (1,5) is not a solution because it is above shaded figure

Answer:

2,007,000,000,000

Step-by-step explanation:

The numbers from left to right here are:

2 trillion

0 hundred billion

0 ten billion

7 billion

0 hundred million

0 ten million

0 million

0 hundredthousand

0 ten thousand

0 thousand

0 hundreds

0 tens

0 ones

Answer:

B:25    

Plug it in to check                

Scary drew a rectangle with a perimeter of 20 inches and its dimensions are 6 by 4 and the square is a 5 in × 5 in square.

We know that a square has 4 identical sides.

The square's perimeter is equivalent to the product of its four sides. The square's side length continues to be the same as the circumference measurement unit.

Perimeter = Side + Side + Side + Side = 4 Side

Perimeter = 4 × side of the square

If ‘a’ is the length of side of square, then perimeter is:

Perimeter = 4a unit

therefore,

20 = 4 × side length

side length = 20/4 = 5 in

it is a 5 in × 5 in square.

We know that a rectangle has 2 pairs of sides that are equally long inside their pair.

The entire distance that the rectangle's outer boundary covers is referred to as its perimeter. Its length is expressed in units. The perimeter calculation is provided by:

Perimeter, P = 2 (Length + Width)

and so, you have in this case a perimeter of

= 2 × 6 + 2 × 4

= 12 + 8

= 20 in

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If the sequence is geometric, the common ratio 2:1.

In mathematics, an Sequence is an enumerated collection of objects in which repetition is allowed and in case order. Like a collection, it contains members (also called elements or items). The number of elements (possibly infinite) is called the length of the array. Unlike sets, the same item can appear multiple times at different positions in the sequence, and unlike sets, order matters. Formally, a sequence can be defined in terms of the natural numbers (positions of elements in the sequence) and the elements at each position.

The concept of series can be generalized as a family of indices, defined in terms of any set of indices.

According to the Question:

Given GP is 18,9,0,-9.

Common ratio =  second number/ first number

​                         =  18/9

                       ​ = 2

​So, the common ratio is  2:1

​

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If AD = 2x + 4 and CD = 4x - 4, and they share point D, then x must be equal to 4.

An equatiοn is a mathematical statement that indicates that twο expressiοns are equal.

Hοwever, we can use the fact that they share pοint D tο set them equal tο each οther and sοlve fοr x:

AD = CD

2x + 4 = 4x - 4

Collecting like terms:

2x - 4x = -4 - 4

-2x = -8

Dividing both sides by -2:

x = 4

Hence, if AD = 2x + 4 and CD = 4x - 4, and they share point D, then x must be equal to 4.

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Answer: $5.71

Step-by-step explanation:

Answer:

Step-by-step explanation:

12 quarters = $3

16 dimes = $1.60

17 nickels = $0.85

26 pennies = $0.26

Add everything up and you get $5.71

The function is f(x) = 15x + 25 and you would have 6 services if you were charged $25

We know that the hair salon charges a fixed rate of $25.00 for a haircut and then an additional $15 for any other services, therefore:

Let x = number of services, then we can obtain the function as:

f(x) = 15x + 25 (function)

when we further solve the function, we get the answer for how many services one would have if we were charged $25,

f(x) = 15x + 25

115 = 15x + 25

90 = 15x

6 = x

Now, we know that the function is f(x) = 15x + 25 and you would have 6 services if you were charged $25

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Therefore, the area of the trapezoid is 60 cm².

A trapezoid is a four-sided polygon with two parallel sides (called bases) of different lengths, and two non-parallel sides (called legs). The legs of a trapezoid are usually not congruent and can be of different lengths. Trapezoids can have different shapes and sizes, but they always have at least one pair of parallel sides. The area of a trapezoid can be calculated using the formula:

[tex]Area = ((b_1 + b_2) * h) / 2,[/tex]

where b1 and b2 are the lengths of the parallel bases, h is the height or perpendicular distance between the two bases.

To calculate the area of a trapezoid, we use the formula:

[tex]Area = (b_1 + b_2) * h / 2[/tex]

where b1 and b2 are the lengths of the parallel sides of the trapezoid and h is the height (perpendicular distance) between the parallel sides.

In this case, we are not given which sides are the parallel sides and which one is the height, so we cannot directly apply the formula. However, we can make an educated guess based on the dimensions given.

Assuming that the two 8 cm sides are parallel, we can use the formula as follows:

[tex]Area = (b_1 + b_2) * h / 2[/tex]

[tex]Area = (8 cm + 16 cm) * 10 cm / 2[/tex]

[tex]Area = 120 cm^{2} / 2[/tex]

[tex]Area = 60 cm^{2}[/tex]

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Answer:

the other line is over more the line that is on the left so its 6 units to the left

The answer calculates the original square footage of Eamon's home based on the $35 fee per square foot paid for adding 380 square feet past 25% of the original square footage. The original square footage of Eamon's home is 1,520 square feet.

Let's assume that the original square footage of Eamon's home was "x". According to the problem, he had to pay a fee of $35 for every square foot he added past 25% of the original square footage.

Therefore, the square footage he added to his home past 25% of the original square footage was:

380 - 0.25x

And the fee he paid was $2,800. So we can write an equation:

35(380 - 0.25x) = 2,800

Simplifying the equation, we get:

13,300 - 8.75x = 0

Solving for x, we get:

x = 1,520 square feet

Therefore, the original square footage of Eamon's home was 1,520 square feet.

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The size of the bacterial population after 40 minutes.= 1572864000.

"A way to find a multiple unit value from a single unit value as well as the reverse."

In every case, we first count the unit or amount value before figuring out the more or less amount value.

This method is referred to as a unified procedure for this reason.

By dividing the set value by the quantity of sets, one can find numerous set values.

By dividing several set values by the total number of sets, one can determine a set value.

According to our question-

A = 1500(2)600/30

A = 1500(2)20

A = 1500(1048576)

A = 1572864000

Hence, The size of the bacterial population after 40 minutes.= 1572864000.

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To solve this problem, we need to first convert 5 minutes and 15 seconds to a decimal form of minutes.

5 minutes is equal to 5.0 minutes, and 15 seconds is equal to 15/60 = 0.25 minutes. Therefore, the total time in minutes is:

5.0 + 0.25 = 5.25 minutes

Next, we can multiply the number of copies made per minute by the total time in minutes to find the total number of copies made:

36 copies/minute x 5.25 minutes = 189 copies

Therefore, the copy machine makes 189 copies in 5 minutes and 15 seconds.

The optimal number of orange trees to plant per acre in order to produce the highest yield for the grower is 32.

Let x be the number of additional trees beyond 24 that are planted per acre. Therefore, the total number of orange trees planted per acre will be 24 + x.

The yield of oranges per tree decreases by 1 bushel for each additional tree planted, so the yield per tree can be expressed as:

40 - x

The total yield of oranges per acre can be calculated by multiplying the yield per tree by the total number of trees planted:

(40 - x)(24 + x)

To find the optimal number of trees to plant, we want to maximize this expression. We can do this by finding the maximum value of the quadratic expression (40 - x)(24 + x).

To do this, we can use the formula for the vertex of a quadratic function, which is:

x = -b / (2a)

where a and b are the coefficients of the quadratic expression in standard form (ax^2 + bx + c).

In this case, the quadratic expression is:

(40 - x)(24 + x) = -x^2 + 16x + 960

So, a = -1 and b = 16. Plugging these values into the formula for the vertex, we get:

x = -16 / (2(-1)) = 8

Therefore, the optimal number of additional trees to plant beyond the initial 24 trees is 8. The total number of trees to plant per acre is 24 + 8 = 32.

To check that this is indeed the optimal number, we can calculate the yield for adjacent values of x:

When x = 7: (40 - 7)(24 + 7) = 33 * 31 = 1023

When x = 8: (40 - 8)(24 + 8) = 32 * 32 = 1024

When x = 9: (40 - 9)(24 + 9) = 31 * 33 = 1023

Therefore, the optimal number of orange trees to plant per acre in order to produce the highest yield for the grower is 32.

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answer 48h. The maximum volume of a rectangular box without a lid can be found using the equation: V = l x w x h, where V is the volume, l is the length, w is the width, and h is the height.

To solve this problem, you need to first determine the length, width, and height of the box. Since you have 48 m2 of cardboard, you can rearrange the equation to solve for one of the variables.

48 m2 = l x w
w = 48/l

Once you have determined the width, you can then use the equation to solve for the length and the height.

V = l x 48/l x h
V = 48h

Therefore, the maximum volume of such a box is 48h, where h is the height of the box.

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The area of the triangle with two of its sides are 8cm, 11cm and 13 cm and the perimeter is 32cm is 8√30 cm².

Since the perimeter of the triangle with sides a, b and c is a+b+c, therefore, perimeter of triangle with sides 8 cm, 11 cm and c cm with perimeter 32 cm is:

32=8+11+c

c=32−19

c=13

So the sides of triangle are  8 cm, 11 cm and 13 cm

We use heron's formula to find the area of the triangle.

Let us find the semi perimeter:

S = (8+11+13)/2

S = 32/2

S = 16

Now area of the triangle is:

A= √s(s−a)(s−b)(s−c)

A = √16(16−8)(16−11)(16−13)

A = √(16×8×5×3)

A = √1920

A =8√30 cm²

Hence, the area of the triangle is 8√30 cm².

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—-------- Correct question format is given below —--------

(Q). Find the area of a triangle, two of its sides are 8cm and 11cm and the perimeter is 32cm.

We can conclude that the high school coach's claim is wrong, and the average pulse rate of students trying out for sports is not 62.4 bpm. The p-value is 0.014.

To compute the p-value, the following steps will be carried out in order;

State the null and alternative hypotheses and select a level of significance (α).

Then, apply the Z-test.

Statistical inference should be made.

The P-value should be calculated.

The findings must be interpreted.

This test is carried out to see whether the given data (sample) is enough to refute the null hypothesis that the mean population pulse rate is 62.4 bpm. ([tex]H_O[/tex]).

The alternate hypothesis ([tex]H_A[/tex]) is that the mean pulse rate is not equal to 62.4 bpm. ([tex]H_A[/tex]).

Hence; [tex]H_O[/tex]:

µ = 62.4 bpm [tex]H_A[/tex]: µ ≠ 62.4 bpm

We choose a level of significance of α= 0.05.

The significance level is usually referred to as alpha (α), which is a probability threshold that the sample data is used to assess.

When the null hypothesis is rejected, alpha (α) is the probability of making a Type I mistake.

When the null hypothesis is correct, it represents the probability of rejecting it.

We'll next use the Z-test in this scenario, which is the most common type of hypothesis test for population means when the population standard deviation (σ) is known.

The Z-test is performed using the following formula;

Z = (X - µ) / (σ / √n)

where; X = sample mean

µ = hypothesized population mean

σ = population standard deviationn = sample size

Substituting the values given;

Z = (65.0 - 62.4) / (10.3 / √32)Z = 2.17 (to 2 decimal places)

The p-value is calculated next;

P (Z > 2.17) = 0.014 (to 3 decimal places).

In conclusion, since the P-value is less than the significance level, we reject the null hypothesis.

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