Help me this is so hard I’ll give u brainlist

Answer:

Step-by-step explanation:

Given system of equations

Express the first equation as

Substitute the value of y into second equation

Solve for x

Find the value of y

Answer:

(-5, 9)

Step-by-step explanation:

Given system of linear equations:

\(\begin{cases}-2x-y=1\\-4x-y=11\end{cases}\)

To solve by substitution, use arithmetic operations to isolate y in Equation 1:

\(\implies -2x-y=1\)

\(\implies -2x-y+y=1+y\)

\(\implies -2x=1+y\)

\(\implies -2x-1=1+y-1\)

\(\implies y=-2x-1\)

Substitute the expression for y into Equation 2 and solve for x:

\(\implies -4x-(-2x-1)=11\)

\(\implies -4x+2x+1=11\)

\(\implies -2x+1=11\)

\(\implies -2x+1-1=11-1\)

\(\implies -2x=10\)

\(\implies -2x \div -2=10 \div -2\)

\(\implies x=-5\)

Substitute the found value of x into one of the equations and solve for y:

\(\implies -2(-5)-y=1\)

\(\implies 10-y=1\)

\(\implies 10-y+y=1+y\)

\(\implies 10=1+y\)

\(\implies 10-1=1+y-1\)

\(\implies y=9\)

Therefore, the solution to the given system of linear equations is (-5, 9).

Learn more about system of equations here:

https://brainly.com/question/27931586

Answer:

2 46/65

Step-by-step explanation:

Answer:

2.71

Step-by-step explanation:

divide 176 by 65= 2.71

Kate will have to pay $56.25 out of pocket for her doctor visit.

The formula for calculating coinsurance is Coinsurance = (Cost of Service x Coinsurance Percent) / 100.If Kate has not met her deductible yet, she will need to pay the full $25 deductible plus 25% of the remaining bill.

The formula for calculating the amount Kate needs to pay is as follows:

Cost to Patient (C) = Deductible (D) + Coinsurance (C) * (Bill – Deductible)  In this case, Kate would need to pay (125 x 25) / 100 = $31.25. The extra $25 is the deductible, which is the amount she must pay before her insurance kicks in.This amount is due immediately upon the visit, regardless of whether or not she has met her deductible So in total, Kate would have to pay $25 + $31.25 = $56.25. In summary, Kate will have to pay $56.25 out of pocket for her doctor visit.

Learn more about total cost here:

https://brainly.com/question/28652728

#SPJ4

Answer:

8x + 1

Step-by-step explanation:

8x + 4 -3

Answer:

8x+1

Step-by-step explanation:

I dunno why my answer has to be at least 20 characters

So the area of the base of the solid is 16 square units.

The base of a solid is the region enclosed by y=-x^2/9 4 and y=0. This region can be found by finding the intersection points of these two equations and then integrating the difference between the two functions.

First, we need to find the intersection points of these two equations. To do this, we can set the two equations equal to each other and solve for x:

y=-x^2/9 4 = y=0

x^2/9 4 = 0

x^2 = 36

x = ±6

So the intersection points are (6,0) and (-6,0).

Next, we need to find the area of the region between these two functions. This can be done by integrating the difference between the two functions:

∫(-x^2/9 4 - 0)dx from -6 to 6

= ∫(-x^2/9 4)dx from -6 to 6

= (-1/9)∫x^2dx from -6 to 6

= (-1/9)(x^3/3) from -6 to 6

= (-1/9)(216/3 - (-216/3))

= (-1/9)(144)

= -16

So the area of the base of the solid is 16 square units.

To know more about area of solids, refer here:

https://brainly.com/question/27683633#

#SPJ11

A two-sample z-test uses the following null and alternative hypotheses:

H0: μ1 = μ2 (the two population means are equal)

HA: μ1 not equal to  μ2 (the two population means are not equal)

A two-sample z-test is used to test whether two population means are equal.

This test assumes that the standard deviation of each population is known

Two Sample Z-Test: Formula

A two-sample z-test uses the following null and alternative hypotheses:

H0: μ1 = μ2 (the two population means are equal)

HA: μ1 not equal to  μ2 (the two population means are not equal)

\(z=(x'_1-x_2')/\sqrt{s_1^2/n_1^2+s_2^2/n_2^2\)

Example,

Suppose the IQ levels among individuals in two different cities are known to be normally distributed each with population standard deviations of 15.

A scientist wants to know if the mean IQ level between individuals in city A and city B are different, so she selects a simple random sample of  20 individuals from each city and records their IQ levels.

To test this, she will perform a two-sample z-test at significance level α = 0.05 using the following steps:

Suppose she collects two simple random samples with the following information:

x1 (sample 1 mean IQ) = 100.65

n1 (sample 1 size) = 20

x2 (sample 2 mean IQ) = 108.8

n2 (sample 2 size) = 20

Z=-1.718

According to the Z Score to P Value Calculator, the two-tailed p-value associated with z = -1.718 is 0.0858.

Since the p-value (0.0858) is not less than the significance level (.05), the scientist will fail to reject the null hypothesis.

There is not sufficient evidence to say that the mean IQ level is different between the two populations.

learn more about  two-sample z-test,

https://brainly.com/question/21166113

#SPJ4

(a) The length of wire that should be used for the square in order to maximize the total area is 9 meters.

(b) Using the same 9 meters of wire for the square will result in the minimum total area as well as the maximum total area.

(a) To maximize the total area, we need to use as much wire as possible for the square and as little as possible for the triangle. Let x be the length of wire used for the square, then the length of wire used for the triangle is 9 - x.

For the square, we have:

4s = x, where s is the side length of the square.

For the equilateral triangle, we have:

3t = 9 - x, where t is the side length of the equilateral triangle.

Solving for x in terms of s and t, we get:

x = 4s and x = 9 - 3t/2.

Substituting x = 4s into x = 9 - 3t/2, we get:

4s = 9 - 3t/2

8s = 18 - 3t

t = (18 - 8s)/3

The area of the square is given by A = s^2, and the area of the equilateral triangle is given by A = (\(\sqrt{3}\)/4)t^2.

Substituting t = (18 - 8s)/3, we get:

A = (\(\sqrt{3}\)/4)((18 - 8s)/3)^2

To maximize the total area, we need to maximize A, which is a function of s. Taking the derivative of A with respect to s, we get:

dA/ds = -4\(\sqrt{3}\)(4s-9)/27

Setting dA/ds = 0, we get:

4s - 9 = 0

Solving for s, we get:

s = 9/4

Therefore, the length of wire that should be used for the square in order to maximize the total area is:

x = 4s = 9 meters.

(b) To minimize the total area, we need to use as little wire as possible for the square and as much as possible for the triangle. Let x be the length of wire used for the square, then the length of wire used for the triangle is 9 - x.

Using the same equations as in part (a), we get:

t = (18 - 8s)/3

A = (\(\sqrt{3}\)/4)((18 - 8s)/3)^2

Taking the derivative of A with respect to s, we get:

\(dA/ds = -4\sqrt{3}(4s-9)/27\)

Setting dA/ds = 0, we get:

4s - 9 = 0

Solving for s, we get:

s = 9/4

This is the same value as in part (a), which means that using 9 meters of wire for the square will result in the minimum total area as well as the maximum total area.

To know more about total area: https://brainly.com/question/884576

#SPJ11

Answer:

Evelyn brought "x" apples for 5 dollars each. Then she has a discount for 2 dollars. The final total is 28. If "x" equals the number of apples, how many apples did she buy?

Answer:

C

Step-by-step explanation:

Just finished that assessment!

Hope this helps

The equation 0.75(x + 40) = 0.35(x + 20) has a unique solution.

To solve the equation, we start by simplifying both sides. Distributing the values inside the parentheses, we get 0.75x + 30 = 0.35x + 7. Next, we aim to isolate the variable x on one side of the equation. To do this, we subtract 0.35x from both sides, resulting in 0.75x - 0.35x + 30 = 0.35x - 0.35x + 7. Simplifying further, we have 0.4x + 30 = 7. Now, we subtract 30 from both sides to isolate the term with x, which gives 0.4x = -23. Finally, we divide both sides by 0.4 to find the value of x, leading to x = -57.5. Therefore, the equation has a unique solution: x = -57.5. There are no other values of x that satisfy the equation, making this the only solution.

Learn more about unique solution here:

https://brainly.com/question/31902867

#SPJ11

Answer:

1/36

Step-by-step explanation:

Assuming that there are 2 dice

There are 36 possible outcomes ( 6*6)

There is only one way to get 2 ones

P ( 1,1) =  positive outcomes / total

          =1/36

If the scale upon which points a, b, c, and d are shown is an ordinal scale, we can meaningfully say that the order of the points represents the order of the underlying variable being measured.

When using an ordinal scale, the order of the points (a, b, c, and d) represents the relative ranking or ordering of the underlying variable being measured. This means we can determine which point is higher or lower in the ranking. For example, if the variable being measured is satisfaction level, we can say that point "c" represents higher satisfaction than point "a" or "b." However, with an ordinal scale, we cannot make precise quantitative comparisons between the points or determine the exact magnitude of the differences between them. The scale only allows us to establish the relative order or ranking of the points.

To know more about ordinal scale,

https://brainly.com/question/30358526

#SPJ11

The dial for the standard combination lock is fastened to a spindle. The spindle travels through many wheels and a drive cam inside the lock. Every number has one wheel, hence the number of wheels in a wheel pack depends on how many numbers are in the combination.

The lock uses the numbers 0 to 39 and has 64,000 distinct combinations.

How many possible three-number combinations are there?

You have 10 options for the first digit, 9 options for the second digit, and 8 options for the third digit, giving you 10x9x8 = 720 if you want all three possible numbers with no duplication of the digits.

To learn more about Three-number combination refer to:

https://brainly.com/question/27242731

#SPJ4

The percentage error is 11.1%

Percentage error is simply the difference between the exact and the estimated values as a percentage

The given parameters are:

The percentage error is then calculated as:

\(\% E = \frac{50 - 45}{45} \times 100\%\)

Evaluate the difference

\(\% E = \frac{5}{45} \times 100\%\)

So, we have:

\(\% E = \frac{500}{45} \%\)

\(\% E = 11.1\%\)

Hence, the percentage error is 11.1%

Read more about percentage errors at:

https://brainly.com/question/5493941

Answer:

c + p <= 20

2c >= p

Step-by-step explanation:

We can declare our variables as:

c = pounds of chicken

p = pounds of pork

The total meat can be expressed as c + p, and at most signifies that the family needs 20 pounds or less. Putting this together, one equation becomes c + p <= 20.

The family additionally wants at least 2 * c as p, which means that 2*c is greater than or equal to p, or 2c >= p.

hope this helps :)

Answer:

2miles = $3

6 miles = $5

3 miles

Step-by-step explanation:

By observation of the graph, the lines match up from 2 miles to $3

Answer:

offcourse it will be 2 miles .

Answer:

296

Step-by-step explanation:

328+57843=6112

56 + 586=642

6432+86=6518

BUT ADD THEM ALL UP YOU GET 296

Answer:

Step-by-step explanation:

Those two angles are equal. They are corresponding angles.  In two parallel lines crossed by a transversal. 8 angles are produced. 4 have one value and the other 4 are supplementary to the first four.

These 2 are part of the first group of 4.

So 12x -  8 = 104

12x - 8 + 8 = 104 + 8

12x = 112

x = 9 1/3

Answer:

See below

Step-by-step explanation:

For shoveling:

24.60 / 4 = $6.15 per hour

For coaching:

14.90 / 2 = $7.45 per hour

She earned more per hour from coaching.

Answer:

                                                 Class

                                    YES                  NO             TOTAL

                    YES         26                      9                   35

Country

                     NO         37                     26                  63

                TOTAL        63                     35                  98

To determine the equation of the tangent plane and normal line of the given curve at the point P(2, -3, 18), we need to find the partial derivatives of the function f(x, y, z) = x^2 + y^2 - 2xy - x + 3y - z - 4.

Taking the partial derivatives with respect to x, y, and z, we have:

fx = 2x - 2y - 1

fy = -2x + 2y + 3

fz = -1

Evaluating these partial derivatives at the point P(2, -3, 18), we find:

fx(2, -3, 18) = 2(2) - 2(-3) - 1 = 9

fy(2, -3, 18) = -2(2) + 2(-3) + 3 = -7

fz(2, -3, 18) = -1

The equation of the tangent plane at P is given by:

9(x - 2) - 7(y + 3) - 1(z - 18) = 0

Simplifying the equation, we get:

9x - 7y - z - 3 = 0

To find the equation of the normal line, we use the direction ratios from the coefficients of x, y, and z in the tangent plane equation. The direction ratios are (9, -7, -1).Therefore, the equation of the normal line passing through P(2, -3, 18) is:

x = 2 + 9t

y = -3 - 7t

z = 18 - t

where t is a parameter representing the distance along the normal line from the point P.

To learn more about tangent plane click here : brainly.com/question/33052311

#SPJ11

The percentage of the population that identified themselves as multiracial in the 2010 census was 2.9%.

According to data from the U.S. Census Bureau, in 2010, 9 million people (or 2.9% of the population) identified as multiracial when given the option to check more than one box for their race.

It's worth noting that the option to check more than one box for race was first introduced in the 2000 census, and the multiracial population has been growing steadily since then. In the 2000 census, 6.8 million people (or 2.4% of the population) identified as multiracial, so there was a significant increase in the number of people identifying as multiracial in the 2010 census. Additionally, the Census Bureau projects that the multiracial population will continue to grow in future censuses.

For more about population:

https://brainly.com/question/31598322

#SPJ4

Answer: 0.375 or 37.5%.

Step-by-step explanation:

To calculate the number of days with 20 or more customers, subtract the days with fewer than 20 customers from the total number of days:

Day(s) with 20 or more customers = 40 - 25 = 15

So, out of the 40 days, 15 days had 20 or more customers between 10:00 and 11:00 a.m. As a result, the likelihood of 20 or more customers on the forty-first day is:

Probability = number of occurrences of event / total number of trials

15/40 is the probability.

0.375 is the probability.

As a result, the probability of there being 20 or more customers between 10:00 and 11:00 a.m. on the forty-first day is 0.375, or 37.5%.

The correct answer to the question is that the area of the shaded region is approximately 0.1894.

The standard normal distribution is a bell-shaped curve that represents the distribution of a random variable that has a mean of 0 and a standard deviation of 1. The Z-score is a measure of how many standard deviations a given value is from the mean. In this case, the Z-score is -0.88, which means that the bone density score is 0.88 standard deviations below the mean.

To find the area of the shaded region, we need to use a standard normal distribution table or a calculator that can calculate the cumulative probability. The shaded region represents the probability that a bone density score is less than or equal to -0.88. Using a standard normal distribution table, we can find the cumulative probability for a Z-score of -0.88, which is 0.1894.

Therefore, the  answer is that the area of the shaded region is approximately 0.1894, which represents the probability that a bone density score is less than or equal to -0.88 on a standard normal distribution.

To know more about standard normal distribution visit:

brainly.com/question/31379967

#SPJ11

Answer:

- 12s² + 11st - 2t²

Step-by-step explanation:

Given

(- 3s + 2t)(4s - t)

Each term in the second factor is multiplied by each term in the first factor, that is

- 3s(4s - t) + 2t(4s - t) ← distribute both parenthesis

= - 12s² + 3st + 8st - 2t² ← collect like terms

= - 12s² + 11st - 2t²

The solution of the surface integral is ∫∫∫ z² r dz dθ dr

To begin, we first need to parametrize the surface S. A common way to do this is to use cylindrical coordinates (r, θ, z), where r and θ are polar coordinates in the x-y plane and z is the height of the surface above the x-y plane. Using this parametrization, we have:

x = r² cos²θ + z² y = r² sin²θ + z² z = z

To find the limits of integration for r, θ, and z, we use the bounds given in the problem. Since 0 ≤ x ≤ 4, we have 0 ≤ r² cos²θ + z² ≤ 4. Simplifying this inequality gives us:

-z ≤ r cosθ ≤ √(4 - z²)

Since r is always positive, we can divide both sides by r to get:

-cosθ ≤ cosθ ≤ √(4/r² - z²/r²)

The left-hand side gives us θ = π, and the right-hand side gives us θ = 0. For z, we have 0 ≤ z ≤ √(4 - r² cos²θ). Finally, for r, we have 0 ≤ r ≤ 2.

With our parametrization and limits of integration determined, we can now write the surface integral as a triple integral in cylindrical coordinates:

∬ S z² dS = ∫∫∫ z² r dz dθ dr

where the limits of integration are:

0 ≤ r ≤ 2 π ≤ θ ≤ 0 0 ≤ z ≤ √(4 - r² cos²θ)

To know more about integral here

https://brainly.com/question/18125359

#SPJ4

The total cost of the ingredient is $0.84 for 6 ounces.

Define fixed cost.

The cost or expense known as fixed cost is unaffected by a short-term horizon's growth or reduction in the number of units produced or sold. To put it another way, it refers to a cost that is linked to a time period rather than a specific economic activity.

It can be viewed as costs that a business must pay regardless of the volume of business activity, such as the number of units produced or sales made. One of the two main parts of the overall manufacturing cost is the fixed cost.

Solution Explained:
Given,

1 pound = $2.25

Since 1 pound = 16 ounces

So, 16 ounces = 2.25

      1 ounce = 2.25/16 = 0.14

Therefore, 6 ounces = 0.14 X 6 = 0.84

To learn more about fixed cost, use the link given
https://brainly.com/question/24868261
#SPJ4