a sample of 144 was taken from a population with a standard deviation of 36 inches. In this case the sample mean will be within how many inches of the population mean 99.7% of thew time?

1.  -3(2x-3) = 25-8x is given.

2.  -6x+9 = 25-8x  simplified the left hand side

3. 2x+9 = 25 eft hand side of the equation and simplified

4. 2x = 16 equation are brought to the right side of the equation and simplified

5.  the whole equation is divided by 2 in order to get the value of 'x' i.e. x = 8.

We are provided with an equation and are required to give reasons on how we got the final answer.

(1.) The equation is -3(2x-3) = 25-8x is given.

(2.) In this step, we have simplified the left hand side of the equation by opening the bracket i.e. -6x+9 = 25-8x

(3.) Here, the terms containing 'x' are brought to the left hand side of the equation and simplified i.e. 2x+9 = 25

(4.) Now, the constant terms of the equation are brought to the right side of the equation and simplified i.e. 2x = 16.

(5.) Lastly, the whole equation is divided by 2 in order to get the value of 'x' i.e. x = 8.

Hello from MrBillDoesMath!

Answer:

x = (1/2) (z + y)    

Discussion:

Solve    2x-y =z for x.

2x -y = z      =>              

2x -y + y = z + y   =>            ( add "y" to both sides)

2x = z + y

x = (1/2) (z + y)                     ( divide both sides by 2)

Regards,  

MrB

P.S.  I'll be on vacation from Friday, Dec 22 to Jan 2, 2019. Have a Great New Year!

Answer:

Your answer would be C because a trinomial consists of 3 parts!

Step-by-step explanation:

Answer:

[tex]2x^3-7y^3 +14[/tex]

Step-by-step explanation:

Trinomial is a expression that has 3 terms. Now we check the options that has 3 terms.Terms are separated by operators like +,- , x or \

5xy has only one term

[tex]2x-7[/tex] has two terms 2x and -7. So it is not a trinomial

[tex]2x^3-7y^3 +14[/tex] has three terms 2x^3, -7y^3 and +14. So it is a trinomial.

[tex]2y^2+7y[/tex] has two terms, So it is not a trinomial

Answer: (C) 1

Step-by-step explanation:

The question is asking which y-value are not represented in the graph.  IN other words, they are asking for which values are not included in the range.

You can do this by graphing the equations:

y = x + 2    for x ≥ 0     has a y-intercept of +2 with y-values increasing

y = x - 2     for x < 0     has a y-intercept of -2 with y-values decreasing

Therefore, there are no y-values between +2 and -2 (including -2). The only option provided between these values is 1, which is option C.

Step-by-step explanation:

The given function is an increasing piecewise function with a jump at x=0 from

f(0-) = -2 to f(0)=+2.

Hence values of f(x) in the interval (-2,+2] cannot be achieved, since

for all x<0, f(x)<-2, and

for all x>=0, f(x)>= +2.

See attached graph for visual explanation.

Answer:

$307.5.

Step-by-step explanation:

We have been given that Elena's aunt bought her a $150 savings bond when she was born.When Elena is 20 years old, the bond will have earned 105% in interest.  

To find bond's value after 20 years we will add 105% of 150 to 150.

[tex]\text{Bond's value after 20 years}=150+(\frac{105}{100}\times 150)[/tex]

[tex]\text{Bond's value after 20 years}=150+(1.05\times 150)[/tex]

[tex]\text{Bond's value after 20 years}=150+157.5[/tex]

[tex]\text{Bond's value after 20 years}=307.5[/tex]

Therefore, the bond will be worth $307.5, when Elena will be 20 years old.

Using the formula for future value, the $150 savings bond bought for Elena that earned 105% interest by the time she's 20 years old will be worth $307.50.

The question involves calculating the future value of a savings bond when it will have earned a specific percentage in interest. In Elena's case, her aunt bought her a $150 savings bond, and this bond will have earned 105% in interest by the time Elena is 20 years old.

Calculating the future value of the bond can be done using the formula:

Future Value (FV) = Present Value (PV) × (1 + Interest Rate (i))ⁿ

For Elena's savings bond:

Inserting these values into the formula, we get:

FV = $150 × (1 + 1.05)

Therefore, the future value of the bond when Elena is 20 years old will be:

FV = $150 × 2.05

FV = $307.50

So, Elena's bond will be worth $307.50 when she is 20 years of age.

Answer:

CN Tower = 550 m and church tower = 160 m

Step-by-step explanation:

The first equation x + y = 710 is correct

but the second one is

x - y = 390    

Note x = height of the CN tower and y = height of the church.

x + y = 710

x - y = 390

If we add the 2  above equations we eliminate y so

2x = 1100

x = 550 m

and y = 710 - 550 =  160 m

Answer:

[tex]sin(6x) - sin(x)= 2cos(\frac{7x}{2}) * sin(\frac{5x}{2})[/tex]

Step-by-step explanation:

To write sin6x-sinx  as a product , we use formula

[tex]sin(a) - sin(b)= 2cos(\frac{a+b}{2}) * sin(\frac{a-b}{2})[/tex]

We have 6x in the place of 'a'  and x in the place of b

Replace it in the formula

[tex]sin(a) - sin(b)= 2cos(\frac{a+b}{2}) * sin(\frac{a-b}{2})[/tex]

[tex]sin(6x) - sin(x)= 2cos(\frac{6x+x}{2}) * sin(\frac{6x-x}{2})[/tex]

[tex]sin(6x) - sin(x)= 2cos(\frac{7x}{2}) * sin(\frac{5x}{2})[/tex]

Answer:

Ruth is  x+4=7/3+4,   esmerelda  is  5x+4=35/3+4

Step-by-step explanation:

if Ruth is x, esmerelda is 5x,

four years ago,

Ruth is x+4,  esmerelda is 5x+4,  depend on the sum, we get:

x+4+5x+4=22, x=7/3

so:

Ruth is  x+4=7/3+4,   esmerelda  is  5x+4=35/3+4

Answer:

Concentration of solution A = 23%

and concentration of solution B = 2%

Step-by-step explanation:

Lets get started

lets say that we concentration of solution A be x% and concentration of second solution be y%

we also know that first mixture is obtained by mixing them in ratio of 2:7

so linear equation representing this situation can be written as:

2(x%)+7(y%)= 9(6.66%)    

changing percentage to decimal we get,

.02x+.07y=9(.0666)

.02x+.07y = 0.6          (equation 1 )

similarly , second mixture is obtained by mixing them in ratio of 7:3

so linear equation can be written as:

7(x%)+3(y%) = 10(16.7%)

.07x +.03y = 1.67     (equation 2)

solving equations 1 and 2  we get

x =  23 and y = 2

so concentration of solution A = 23%

and concentration of solution B = 2%

That's the final answer

Hope it was helpful !!

Answer:

B.5.6g

Step-by-step explanation: Density of object=mass/volume

Therefore, Mass=density of object X volume

                           =0.7 X 8

                           =5.6g

Answer:

Mass of an object is:

B. 5.6 g

Step-by-step explanation:

Mass of an object= Density × Volume

An object that has a density of 0.7 g/cm³

and a volume of 8 cm³

Mass= 0.7 g/cm³ × 8 cm³

       = 5.6 g

Hence, Correct option is:

B. 5.6 g

Answer:

 x = - 50

Step-by-step explanation:

-2/5 x - 2 = 18

-2x - 10 = 90

-2x = 100

 x = - 50

Answer:

A) -50

Step-by-step explanation:

The given equation -2/5 x - 2 = 18

Here we have to find the value of x.

Step 1: Isolate the constant.

Add 2 on both sides, we get

-2/5x - 2 + 2 = 18 +2

-2/5x = 20

Step 2: Multiply both sides by the reciprocal of -2/5

The reciprocal of -2/5 is -5/2

x = 20 * -5/2

x = -100/2

x = -50

Answer: x = -50

We are given the two bases of the trapezium:

[tex] ED = 5,\qquad AB = 9 [/tex]

The formula for the area of the trapezium is

[tex] A = \dfrac{(B+b)h}{2} [/tex]

So, we only need to figure out the length of the height EF.

We know that FA+EF = 11. Also, we're given that the perimeter of ABCF is 28, which means

[tex] 2AB+2FA = 28 \iff 2\cdot 9 + 2FA = 28 \iff 2FA = 10 \iff FA = 5 [/tex]

So, we can deduce

[tex] EF = 11-FA = 11-5=6 [/tex]

And so we're ready to use the solving formula:

[tex] A = \dfrac{(5+9)\cdot 6}{2} = \dfrac{14\cdot 6}{2} = 7\cdot 6 = 42 [/tex]

Answer: It has one solution. The solution is (x,y) = (-4,-3)

Add up the equations doing so straight down

x + -x = 0x = 0 so the x terms go away

2y + 2y = 4y

-10 + (-2) = -12

We end up with 4y = -12 so y = -3 after you divide both sides by 4. Use this y value to find the value of x

x+2y = -10

x + 2(-3) = -10

x - 6 = -10

x = -10+6

x = -4

The single solution is (x,y) = (-4,-3)

As a check, plug this solution into each equation to see if you get a true statement or not. Let's do so with the first equation

x+2y = -10

-4 + 2(-3) = -10

-4 - 6 = -10

-10 = -10 .... true

and then the second equation

-x+2y = -2

-(-4) + 2(-3) = -2

4 - 6 = -2

-2 = -2 .... true

both equations are true, so the solution is confirmed

Answer:

it will take 355 minutes or 5 hours 55 minutes to be half empty. An equation would be (8,520 ÷ 2) ÷12 = m

Step-by-step explanation:

First, you must find half of 8,520 to see how much will half to be left in the pool for the problem. 8,520÷2=4,260

Second, you have to divide 4,260 by twelve to find out how many minutes it will take to become half empty.

Good luck ;b

Answer:

The equation that can be used to find the number of minutes that it would take for the pool to be half full is:

M = (8,520 / 2) / 12

As a result, it would take 355 minutes for the pool to be half full.

Step-by-step explanation:

First, we must determine how many gallons the half-filled pool has. If completely filled it has a capacity of 8,520 gallons, half-filled this should have a capacity of 8,520 / 2, that is, 4,260 gallons.

Then, we must divide this amount of gallons by the gallons that are lost per minute, that is, 4,260 / 12. In this way we get the amount of minutes it takes for the pool to reach half its capacity.

Then, the equation to determine the amount of minutes (M) it takes for the pool to reach half its capacity is: M = (8,520 / 2) / 12

Answer:

Step-by-step explanation:420÷24=20, so 2 sides are 20, and 2 sides are 24. 20+20+24+24=88 feet of fencing

Answer:

392 ft

Step-by-step explanation:

Hello, Let me help you with this

to find the real length and width you can use a rule of three

Step 1

length=8 in

Let

if

2.5 in ⇔ 35 ft

8 in ⇔ X ft ?

the relation is

[tex]\frac{2.5\ in}{35\ feet}=\frac{8\ in }{x}\\\\solve\ for\ x\\\frac{x*2.5\ in}{35\ feet}=8\ in\\x*2.5\ in=8\ in *35\ feet\\x=\frac{8\ in *35\ feet}{2.5\ in}\\ x=112\ ft[/tex]  

Step 2

width=6 in

Let

if

2.5 in ⇔ 35 ft

6 in ⇔ X ft ?

the relation is

[tex]\frac{2.5\ in}{35\ feet}=\frac{6\ in }{x}\\\\solve\ for\ x\\\frac{x*2.5\ in}{35\ feet}=6\ in\\x*2.5\ in=6\ in *35\ feet\\x=\frac{6\ in *35\ feet}{2.5\ in}\\ x=84\ ft[/tex]  

Step 2

find the perimeter using

Perimeter = 2*length +2* width

replacing

Perimeter= 2*112 ft +2* 84 ft

Perimeter=224 ft +168 ft

Perimeter=392 ft

Have a nice day

Answer:

The probability that exactly 2 of the rolls is a sum of 7 will is 0.296

Step-by-step explanation:

The probability of rolling a sum of 7 when rolling two dice simultaneously is 0.167.

Let us assume that, A be the event that the sum is 7. So,

[tex]P(A)=0.167[/tex]

Binomial probability represents the probability that a binomial experiment results (i.e either success or failure or only two results) in exactly x successes.

[tex]b(x;\ n, p) =\ ^nC_x \cdot p^x \cdot (1-p)^{n - x}[/tex]

So the probability that exactly 2 of the rolls is a sum of 7 will be,

[tex]P(2) =\ ^{12}C_2 \cdot (0.167)^2 \cdot (1-0.167)^{12 - 2}[/tex]

[tex]=\ ^{12}C_2 \cdot (0.167)^2 \cdot (0.833)^{10}[/tex]

[tex]=66 \cdot (0.167)^2 \cdot (0.833)^{10}[/tex]

[tex]=0.296[/tex]

The answer is B.

B . The diagonals are congruent.

A. The diagonals of any rhombus bisect each other, but that does not prove it is a rectangle.

B. The quadrilateral is a parallelogram, and the diagonals are congruent. It must be a rectangle.

C. The diagonals are congruent and perpendicular in any rhombus, but that does not make it a rectangle.

D. This proves a rhombus, but not necessarily a rectangle.

Answer:

r ≈ 0.98

Step-by-step explanation:

The correlation coefficient is easily calculated by almost any scientific or graphing calculator, or by a spreadsheet. It is mainly a matter of data entry and invoking the appropriate function. Here, the correlation coefficient is computed as about 0.97716, or 0.98 when rounded to the nearest hundredth.

Answer:

The correlation coefficient is 0.0002273427

Step-by-step explanation:

Given the data of heart rate and we have to find the correlation coefficient which can be calculated as

[tex]r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^{2}-(\sum x)^{2} ] [n\sum y^{2}-(\sum y)^{2} ] }} }[/tex]

       = [tex]=\frac{12(7949)-68(1341)}{\sqrt{[12(430)-4624][12(152729)-1798281]} }[/tex]

       = [tex]\frac{4200}{(536)(34467)}[/tex]

       = 0.0002273427

Answer:

19

Step-by-step explanation:

19-10=9

Answer:

a

Step-by-step explanation:

Answer: (D) -3 < x < 17

Step-by-step explanation:

x must satisfy both Part 1 and Part 2 below:

Part 1:  Length must be greater than 0 so:

2x + 6 > 0       and        x + 23 > 0

       x > -3       and               x > -23

To satisfy both, x > -3

Part 2: The 80° is less than the 100° so the corresponding side of 80° must also be less than the corresponding side of 100°

        80° < 100°

⇒ 2x + 6 < x + 23

      x + 6 <       23

      x       <        17

Therefore x must be between -3 and 17

⇒  -3 < x < 17

************************************************************

Answer: (C) -1.6 < y < 7

Step-by-step explanation:

y must satisfy both Part 1 and Part 2 below:

Part 1:  Length must be greater than 0 so:

4y + 15 > 0             and        5y + 8 > 0

         y > -3.75       and               y > -1.6

To satisfy both, y > -1.6

Part 2: The 60° is less than the 105° so the corresponding side of 60° must also be less than the corresponding side of 105°

        60° < 105°

⇒ 5y + 8 < 4y + 15

      y + 8 <        15

      y       <         7

Therefore y must be between -1.6 and 7

⇒  -1.6 < y < 7

************************************************************

Answer: (A) 2.4 < y < 5

Step-by-step explanation:

y must satisfy both Part 1 and Part 2 below:

Part 1:  Length must be greater than 0 so:

2y + 3 > 0       and        5y - 12 > 0

       y > -1.5       and               y > 2.4

To satisfy both, y > 2.4

Part 2: The 70° is less than the 140° so the corresponding side of 70° must also be less than the corresponding side of 140°

        70° < 140°

⇒ 5y - 12 < 2y + 3

    3y - 12 <         3

    3y       <        15

      y       <          5

Therefore y must be between 2.4 and 5

⇒  2.4 < y < 5

Answer : No, levi's reasoning is incorrect. The correct answer is, [tex]2.63\times 10^{11}[/tex]

Step-by-step explanation :

Scientific notation : It is the representation of expressing the numbers that are too big or too small and are represented in the decimal form with one digit before the decimal point times 10 raise to the power.  The numerical digit lies between 0.1.... to 9.9.....

For example :

5000 is written as [tex]5.0\times 10^3[/tex]

889.9 is written as [tex]8.899\times 10^{-2}[/tex]

In this examples, 5000 and 889.9 are written in the standard notation and [tex]5.0\times 10^3[/tex]  and [tex]8.899\times 10^{-2}[/tex]  are written in the scientific notation.

If the decimal is shifting to right side, the power of 10 is negative and if the decimal is shifting to left side, the power of 10 is positive.

As we are given the 263,000,700,000 in standard notation.

Now converting this into scientific notation, we get:

[tex]\Rightarrow 263,000,700,000=2.63\times 10^{11}[/tex]

As, the decimal point is shifting to left side, thus the power of 10 is positive.

Hence, the correct answer is, [tex]2.63\times 10^{11}[/tex]

Answer:

No. He answered incorrectly. The correct scientific notation of the number will be [tex]2.630007\times10^{11}[/tex].

Step-by-step explanation:

Levi wants to write 263,000,700,000 in the scientific notation.

In scientific notation, the number is represented by a numerical value between 1 and 9.99...., multiplied by power of 10.

The given number can be written as,

[tex]263,000,700,000=2.630007\times100,000,000,000\\263,000,700,000=2.630007\times10^{11}[/tex]

Thus, in scientific notation, the given number can be written as [tex]2.630007\times10^{11}[/tex].

Here, the numerical value is 2.630007 and power of 10 is [tex]10^{11}[/tex].

Now, the power of 10 is 11 which is positive. So, Levi has answered incorrectly.

For more details, refer the link:

https://brainly.com/question/1705769?referrer=searchResults

Answer:

Exponential Decay

Its end behavior on the left is as follows as x approaches negative infinity y approaches positive infinity. Its end behavior on the right is as follows as x approaches positive infinity y approaches negative infinity.

Step-by-step explanation:

We can graph the function by graphing two points when x=0 and x=1.

x=0 has [tex]y=7^{-x} =7^{0} =1[/tex]

x=1 has y=[tex]7^{-x} =7^{-1} =\frac{1}{7}[/tex]

This function starts with higher output values and decreases over time. This is Exponential Decay. Its end behavior on the left is as follows as x approaches negative infinity y approaches positive infinity. Its end behavior on the right is as follows as x approaches positive infinity y approaches negative infinity.

Using limits, it is found that since [tex]\lim_{x \rightarrow \infty} f(x) < \lim_{x \rightarrow -\infty} f(x)[/tex], it is an exponential decay function, as it starts at infinity and ends at 0.

An exponential function is modeled by:

[tex]f(x) = ab^x[/tex].

Then:

In this problem, the function is:

[tex]y = 7^{-x}[/tex]

Hence:

[tex]\lim_{x \rightarrow \infty} f(x) = \lim_{x \rightarrow \infty} 7^{-x} = 7^{-\infty} = \frac{1}{7^{\infty}} = 0[/tex]

[tex]\lim_{x \rightarrow -\infty} f(x) = \lim_{x \rightarrow -\infty} 7^{-x} = 7^{\infty} = \infty[/tex]

Hence, it is exponential decay, as it starts at infinity and ends at 0.

More can be learned about exponential functions at https://brainly.com/question/25537936

Answer:

325 miles

Step-by-step explanation:

65=0.20x

x=65/0.2

x=325 miles

Answer:

[tex]0.017y=0.017x+0.97[/tex]

Step-by-step explanation:

Let us assume that,

number of minutes read by Kiran is = x minutes.

number of minutes read by Andre is = y minutes.

Andre read for 58 minute more than that of Kiran.

Converting minute to hour we get,

[tex]x\text{ minutes}=\dfrac{x}{60}=0.017x\text{ hour}[/tex]

[tex]y\text{ minutes}=\dfrac{y}{60}=0.017y\text{ hour}[/tex]

[tex]58\text{ minutes}=\dfrac{58}{60}=0.97\text{ hour}[/tex]

So the relationship between x and y will be,

[tex]0.017y=0.017x+0.97[/tex]

To relate the number of minutes Kiran read with the number of minutes Andre read, we can use the equation y = x + 58, where x is the number of minutes Kiran read.

To write an equation that relates the number of minutes Kiran read with y, the number of minutes that Andre read, we can use the information given. Let's say Kiran read for x minutes. According to the question, Andre read for 58 more than that, so we can represent Andre's reading time as x + 58. Therefore, the equation would be y = x + 58.

https://brainly.com/question/35492661

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Answer:

8 cm

Step-by-step explanation:

We can use ratio's to solve this problem

4 cm = 5 km

We need to know how many cm = 10 km

4 cm             x cm

---------- = --------------

5 km             10 km

Using cross products

4* 10 = 5* x

40 = 5x

Divide each side by 5

40/5 = 5x/5

8=x

On the map it is 8 cm.

Answer: (A) If it is a bib, then it is a bab

Step-by-step explanation:

p: The bib is a bub.

Rewrite it as: If it is a bib, then it is a bub.

q: The bub is a bab.

Rewrite it as: If it is a bub, then it is a bab

The conclusion of p equals the hypothesis of q so the Law of Syllogism can be applied  --> hypothesis of p → conclusion of q

Answer:

The graph of y = 6x increases at a faster rate than the graph of y = 2x.

Step-by-step explanation:

y=6x and y=2x are proportional relationships of linear functions. It has the form y=mx where m is the rate of change or increase. 6>2 so y=6x will increase faster than 2.

We know the last two statements are not possible because a translation of a graph must be done through addition or subtraction.