The low temperature in degrees celsius for some cities on the same days in march are recorded in the dot plots. Decide if each statement is true or false

Using Gaussian elimination, the solution to the given system of equations is given as follows:

x = 5, y = -11, z = 3.

A system of equations is when multiple variables are related, and equations are built to find the values of each variable, according to the relations given in the problem.

For this problem, the equations are given as follows:

(I suppose there was a typing mistake on the first equation, as Gaussian elimination can only be applied to solve linear systems).

For Gaussian elimination, the first step is building the matrix of the system, in which:

Hence, the matrix of the system is given as follows:

[tex]\left[\begin{array}{cccc}2&-1&4&33\\1&2&-3&-26\\-5&-3&5&23\end{array}\right][/tex]

Then, we need to make the coefficient of x zero in the second and third rows, hence:

Then the matrix will be given by:

[tex]\left[\begin{array}{cccc}2&-1&4&33\\0&5&-10&-85\\0&-11&30&211\end{array}\right][/tex]

Now we need to make the coefficient of y on the third row zero, hence:

R3 -> 11R2 + 5R3.

Then:

[tex]\left[\begin{array}{cccc}2&-1&4&33\\0&5&-10&-85\\0&0&40&120\end{array}\right][/tex]

From the third row, we have that:

40z = 120

z = 120/40

z = 3.

From the second row, we have that:

5y - 10z = -85

5y - 30 = -85

5y = -55

y = -11.

From the first row, we have that:

2x - y + 4z = 33

2x + 11 + 12 = 33

2x = 10

x = 5.

Hence the solution of the system is given by:

x = 5, y = -11, z = 3.

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Answer:

x = 42

Step-by-step explanation:

9*5 = x+3/5*5

45 - 3= x+3 - 3

42 = x

UR WELCOME

Answer:

(0, - 9 )

Step-by-step explanation:

the y- intercept is where the line crosses the y- axis

the line crosses the y- axis at (0, - 9 ) and is the y- intercept

We can say that if the measure of angle 1 = (7x-19), and the measure of angle 2 = (x+5), then the measure of angle 2 is 18°.

Define supplementary angle.

Supplementary angles are those two angles whose sum is always equal to 180 degrees.

Mathematically, a supplementary angle is calculated as follows:

Q + R = 180

Since the angles on this line segment are supplementary angles, we have:

Angle (1) + Angle (2) = 180° - Angle 3

Substituting the given values into the formula, we get;

7x - 19 + x + 5 = 180 - 90

8x - 14 = 90

8x = 90 + 14

8x = 104

x = 104/8

x = 13

Now, we can calculate the length of angle 2 by putting the 'x' value:

Angle 2 = x + 5

Angle 2 = 13 + 5

Angle 2 = 18°

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The first step in simplifying the expression 2(x+3)+5 = 2x+2(3)+5.

Given expression in 'x' is 2(x+3)+5.

In order to simplify this expression, we need to expand it by opening the parenthesis. That is, we need to distribute 2 over (x+3) first. For this we multiply 2 into (x+3) and then only we can add 5 to it.

So, 2(x+3) +5 = 2x + 2(3) +5

                     = 2x +6 +5

                     = 2x+11

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Payroll (FICA) taxes of the question is 0.2295

According to the given data,

Payroll (FICA) taxes is  7.65%

boss promises at least 3 hours but no more than 18 hours per week.

then we get, 3 × 0.0765

                     = 0.2295

therefore, payroll taxes from your paycheck and to deduct  tax

0.2295

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All About the FICA Tax

If you earn a wage or a salary, you’re likely subject to Federal Insurance Contributions Act taxes. Not to be confused with the federal income tax, FICA taxes fund the Social Security and Medicare programs. Also known as payroll taxes, FICA taxes are automatically deducted from your paycheck. Your company sends the money, along with its match (an additional 7.65% of your pay), to the government. In this article we’ll discuss what FICA taxes are, how they’re applied and who’s responsible for paying them.

Planning your finances goes beyond just taxes. Find a local financial advisor today.

FICA Taxes: The Basics

Every payday, a portion of your check is withheld by your employer. That money goes to the government in the form of payroll taxes. There are several different types of payroll taxes, including unemployment taxes, income taxes and FICA taxes. Two types of taxes fall under the category of FICA taxes: Medicare taxes and Social Security taxes.

Paying FICA taxes is mandatory for most employees and employers under the Federal Insurance Contributions Act. The funds are used to pay for both Social Security and Medicare.

If you own a business, you’re responsible for paying Social Security and Medicare taxes, too. For self-employed workers, they’re referred to as SECA taxes (or self-employment taxes) based on regulations included in the Self-Employed Contributions Act.

A wage base limit applies to employees who pay Social Security taxes. This means that gross income above a certain threshold is exempt from this tax. The wage limit changes almost every year based on inflation. In 2021, it was $142,800. For 2022, the limit rose to $147,000. This income ceiling is also the maximum amount of money that’s considered when calculating the size of Social Security benefits.

Medicare taxes, on the other hand, don’t have a wage limit. But there’s an Additional Medicare Tax that high-income individuals must pay. That has been the case since January 1, 2013.

The Additional Medicare Tax rate is 0.90% and it applies to employees’ (and self-employed workers’) wages, salaries and tips. So any part of your income that exceeds a certain amount gets taxed for Medicare at a total rate of 2.35% (1.45% + 0.90%). That income ceiling for 2021 and 2022 is $200,000 for single filers, qualifying widows and anyone with the head of household filing status; $250,000 for married couples filing joint tax returns and $125,000 for couples filing separate tax returns. You can calculate how much you owe using Form 8959.

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the estimate of the product is reasonable and the values are Estimate: 1,305 × 81 ≈ 104,000 and Actual 1,305 × 81 = 105,706

The correct option is D.

In the given statement is:

Find 1, 305 x 81. Then estimate to check your answer.

The estimate of the product is reasonable and the values are Estimate: 1,305 × 81 ≈ 104000 and Actual 1,305 × 81 = 105706

How to estimate and then compute the product check that your answer is reasonable?

The product expression is given as

1,305 × 81

As an estimate, we have

1305 = 1300

81 = 80

So, we have:

1,305 × 81 ≈ 1300 * 80

Evaluate the product

1,305 × 81 ≈ 104000

For the actual product, we have

The estimate and the actual product both approximate to 100000

Hence, the estimate of the product is reasonable and the values are Estimate: 1,305 × 81 ≈ 104,000 and Actual 1,305 × 81 = 105,706

The correct option is D.

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Answer:

15y+14

Step-by-step explanation

Answer: 14 + 15y

Step-by-step explanation:

E = Eileen’s age = 3y

M = Mum’s age

Total Age = 14 + 3y + 4(3y)

                =  14 + 15y

Total age in 7 years time is their current ages plus 7 years for each (14 years)

Eileen is 3y, and her mum is 4 times that, which is 12y, meaning that their total ages are 3y + 12y, or, 15y.

Total age is then 15y + 14. Since we don’t know what y equals, we cannot add these two terms, and we can just leave them like that!

So, the answer is 14 + 15y.

Answer:

5

Step-by-step explanation:

[tex]d=\frac{|-3(5)-4(5)+10|}{\sqrt{(-3)^2+(-4)^2}}=5[/tex]

The sum of the given finite series is 75

The given series is:

[tex]\sum\limits^{10}_{n=5} {(20-n)}}[/tex]

To find the sum of this series,

Expand the summation notation by using the properties of sum operator:

Σ(a+b) = Σa + Σb

Hence,

[tex]\sum\limits^{10}_{n=5} {(20-n)}=\sum\limits^{10}_{n=5} {20}-\sum\limits^{10}_{n=5} {n}[/tex]

If a is a constant, then Σa = k. a, where k is the number of terms = upper limit - lower limit + 1

Using this property:

[tex]\sum\limits^{10}_{n=5} {20} = (10 - 5+1)\times20=6\times20=120[/tex]

Expand

[tex]\sum\limits^{10}_{n=5} {n}=5+6+7+8+9+10=45[/tex]

Hence,

[tex]\sum\limits^{10}_{n=5} {(20-n)}=\sum\limits^{10}_{n=5} {20}-\sum\limits^{10}_{n=5} {n}[/tex]

= 120 - 45 = 75

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Answer: 4000

Step-by-step explanation: 2000 there and 2000 back. 2000+2000=4000

Hope this helps!

Answer: Total volume= 71.21 in^3

Step-by-step explanation:

The volume of the sphere= (4/3)*π*(2^3) = 33.51 in^3

The volume of the cylinder= π*(2^2)*3 = 37.7 in^3

Total volume= 71.21 in^3

This question is incomplete

The population of city 10 years ago before 30% decrease in population was 500,000

In the given statement is :

A city has a population of 350,000.The population has decreased by 30% in the past ten years.

The formula for calculating the percent change between two values over the time is given by:

[tex]p=\frac{A-B}{B}[/tex]×[tex]100[/tex]

where,

'p' represents the percent change

'A' represents the New value

'B' represents the Old value

Since, p is the percent (decreased) = -30

Substitute the given values and solve for B;

then;

[tex]-30=\frac{350,000-B}{B}[/tex] × 100

Divide both sides by 100 we get;

[tex]-0.3=[/tex] [tex]\frac{350,000-B}{B}[/tex]

By cross multiply we get;

-0.3B = 350,000 - B

Add both sides B, we get

-0.3B + B = 350,000

0.7B = 350,000

Divide both sides by 0.7 we get;

B = 500,000

Therefore, The population of city 10 years ago before 30% decrease in population was 500,000

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Identify the property illustrated by the equation.5+(-5)=0  Additive Inverse

What is an additive Inverse ?

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The value of j is j = 103 - k = 115 - f.

A collection of equations for which we searched for common solutions is referred to in mathematics as a system of equations, sometimes known as a set of simultaneous equations or an equation system. Similar to single equations, a system of equations can be categorized. In everyday life, systems of equations are used to model problems when the unknown values can be represented by variables.

Consider the two equations,

f + j = 115                                                                    ----------------------(1)

j + k = 103                                                                   ----------------------(2)

Consider equation (2),

j + k = 103

Subtracting k from each side of the equation.

j + k - k = 103 - k

j = 103 - k

Consider equation (1),

f + j = 115

Subtraction f from each side of the equation,

f + j - f = 115 - f

j = 115 - f

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Answer: $39.62

Step-by-step explanation: To get the answer to the cost of Peter's three items, I took the prices of the three and added them together. This amount would be the amount he paid WITHOUT TAX.

Answer: A; $9; B; D

Step-by-step explanation:

1. 480➗6 = 80%

2. 36➗4= $9

3. 0.85 x 20= 17

4. 28➗2 = 14

14 x 6= 84

Answer:

c = (y+8)/d

Step-by-step explanation:

Answer:

Yes

Step-by-step explanation:

Points D and E are on plane F.

The resultant velocity is about 12.3 feet per second at a heading of 8.4°east of north, <1.8, 12.14>

In this question,

Amy is paddling her canoe across a lake at a speed of 10 feet per second headed due north.

The wind is blowing 40°C east of north with a velocity of 2.8 feet, per second.

We need to find Amy's resultant velocity.

We write the direction vector for Amy in component form.

Due north is equivalent to 90° from the horizontal.

x-component:

x = 10 cos(90°)

x = 0

And y-component:

y = 10 sin(90°)

y = 10

The component form for Amy’s vector is <0, 10>.

Now we write the direction vector for wind in component form.

40 east of north is equivalent to 50° from the horizontal.

x-component:

x = 2.8 cos(50°)

x = 1.8

And y-component:

y = 2.8 sin(50°)

y = 2.14

The component form for the wind’s vector is <1.8, 2.14>

Add the vectors for Amy and the wind.

<0, 10> + <1.8, 2.14> = <1.8, 12.14>

Now, we determine the vector's magnitude by using Pythagoras theorem.

Let v be the velocity of Amy.

Let θ be the angle made by Amy with the horizontal

⇒ tan(θ) = |y/x|

⇒ tan(θ) = |12.14 / 1.8|

⇒ θ = 81.6°

81.6° with the horizontal is equivalent to 8.4° east of north.

Therefore, the resultant velocity is about 12.3 feet per second at a heading of 8.4°east of north, <1.8, 12.14>

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The value of the x in a linear equation is 7.8.

According to the statement

We have to find that the value of x.

So, For this purpose, we know that the

A linear equation is an algebraic equation of the form y=mx+b. involving only a constant and a first-order (linear) term, where m is the slope and b is the y-intercept.

From the given information:

A is between points B and C. AB = 2x - 3, BC = 7x - 10, and AC = 32.

It means

BC = BA + AC

Then we have to substitute the values in it

Then

BC = BA + AC

7x - 10 =  2x - 3 + 32

7x - 2x = -3 +32+10

5x = 39

here the values of the x is a

x = 39/5.

x = 7.8

So, The value of the x in a linear equation is 7.8.

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Answer: The value of x is 20.

Algebraic function :

Given function is,  

We have to find the value of x when

The value of x is 20.

Step-by-step explanation: hope this helps

Step-by-step explanation:

I'm not sure but this is the solution hehe

Answer:

7) x ≥ -3

8) x < -8

Explanation:

[tex]\sf -3(2x-7) \leq 39[/tex]

distribute

[tex]\sf -6x + 21 \leq 39[/tex]

relocate variables

[tex]\sf -6x \leq 39-21[/tex]

simplify

[tex]\sf -6x \leq 18[/tex]

dividing both sides by (-), changes the inequality sign

[tex]\sf x \geq -3[/tex]

[tex]\sf 4x + 9 < x - 15[/tex]

collect like terms

[tex]\sf 4x -x < - 15-9[/tex]

simplify

[tex]\sf 3x < - 24[/tex]

divide both sides by (+)3

[tex]\sf x < -8[/tex]

The time taken by the water to reach 49 degree Celsius is 4 minutes.

According to the question, larger amount of sodium chloride is dissolved in the heating water. And the given data states that the water temperature increases 7 degree Celsius every minute.

Initial temperature of water is 21 degree Celsius.

Let us assume, water reaches at 49° C after 'm' minutes.

As per question, every minute temperature increases as 7°C. So, the expression can be written as: (21 + 7m)°C

⇒ 21 + 7m = 49

⇒m = 4 minutes.

Hence, the time taken to reach 49° C is 4 minutes.

What is temperature?

Temperature defines the atmosphere hotness. And it is expressed in different scales as well as in different parameters like Celsius etc. It is measured through the device known as thermometer.

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The value of f(-3) is 15.

The given function is f(x) = -3x+6. Now, f(-3) = x = -3

Substituting and Evaluating the value of x in the equation f(x) = -3x+6, we get

f(-3) = -3(-3)+6f(−3)=−3(−3)+6

f(-3) = 9+6f(−3)=9+6

f(-3) = 15f(−3)=15

∴ The value of f(-3) for the function f(x) = -3x+6 is equal to 15.

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Answer:

[tex]x = 7[/tex]

Step-by-step explanation:

[tex]5x + 3x = 8 +48[/tex]

  ⬇️

8x = 8 + 48

          ⬇️

  8x = 56

Divide both sides of the equation by the coefficient of the variable;

[tex]x = \frac{56}{8}[/tex]

Cross out common factors;

[tex]x=7[/tex]

A circle is a curve sketched out by a point moving in a plane. The diameter and circumference of the circle are (x/4) units and (x/4)π units, respectively.

A circle is a curve sketched out by a point moving in a plane so that its distance from a given point is constant; alternatively, it is the shape formed by all points in a plane that are at a set distance from a given point, the center.

Given that radius of the circle is x/8 units. Therefore, the diameter and the circumference of the circle can be written as,

Diameter of circle = 2 × (Radius of the circle)

                             = 2 × (x/8) units

                             = x/4 units

Circumference of circle = 2 × π × (Radius of the circle)

                                       = 2 × π × (x/8) units

                                       = (x/4)π units

Hence, the diameter and circumference of the circle are (x/4) units and (x/4)π units, respectively.

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