The mean age of 5 people in a room is 28 years.
A person enters the room.
The mean age is now 29.
What is the age of the person who entered the room?

Answer:

4 ft

Step-by-step explanation:

The area of a triangle is

A = 1/2 bh

9 = 1/2 (4.5)h

9 =2.25 h

Divide each side by 2.25

9/2.25 = 2.25h/2.25

4 =h

Answer:

Hieght=4

hope it helps u...

Step-by-step explanation:

Answer:

12.4+3√7 is  irrational

Step-by-step explanation:

12.4 is a rational number

3√7 is an irrational number

The sum of a rational number and an irrational number is irrational.

So, 12.4+3√7 is  irrational

Answer:

3 (7 a - 5) (a - 2)

Step-by-step explanation:

Factor the following:

21 a^2 - 57 a + 30

Factor 3 out of 21 a^2 - 57 a + 30:

3 (7 a^2 - 19 a + 10)

Factor the quadratic 7 a^2 - 19 a + 10. The coefficient of a^2 is 7 and the constant term is 10. The product of 7 and 10 is 70. The factors of 70 which sum to -19 are -5 and -14. So 7 a^2 - 19 a + 10 = 7 a^2 - 14 a - 5 a + 10 = a (7 a - 5) - 2 (7 a - 5):

3 a (7 a - 5) - 2 (7 a - 5)

Factor 7 a - 5 from a (7 a - 5) - 2 (7 a - 5):

Answer: 3 (7 a - 5) (a - 2)

Answer:

1/3 cup Serving will provide 120 calories and 4 grams of fibre

Step-by-step explanation: one gram = 7.716 calories

1/2 cup serving provides 180 calories and 6 grams.

One cup serving with you provide 360 calories and 12 grams

So

1/3 cup Serving will provide 360/3 calories and 12/3 grams

1/3 cup Serving will provide 120 calories and 4 grams of fibre

Answer:

B.

Step-by-step explanation:

Data

Center = (2, -16)

A (2, -13)

P (-1, -16)

Equation

(x - h)² + (y - k)² = r² or

(x₁ - h)² + (y₁ - k)² = (x₂ - h)² + (y₂ - k)²

Substitution

(2 - 2)² + (-13 + 16)² = (-1 - 2)² + (-16 + 16)²

The signs in my equation and the one in the options are different but the results are the same

Answer:

0.903.

Step-by-step explanation:

Okay, from the question we are given the following information or data or parameters:

''couple plans to have no more than three children, and they will keep having children until they have a girl. So, if their first child is a girl, they will stop and have only one child"

Additionally, from the question we are given that; ''However, if their first child is a boy, they will try again and have a second child".

Also, the probability distribution is given as Boys 0, boys 1 , boy 2, boys 3 boys with Probability 0.490, 0.250, 0.127, 0.133 respectively.

That is, we now have:

Number of boys × probability.

Boys 0 = 0 × 0.490 = 0.

Boys 1 = 1 × 0.250 = 0.250.

Boys 2 = 2 × 0.127 = 0.254.

Boys 3 = 3 × 0.133 = 0.399.

The addition of the products for each Number of boys × probability gives us the expected value. That is to say;

0 + 0.250 + 0.254 + 0.399 = 0.903 = mean.

Answer:

4; 7

Step-by-step explanation:

Small box = 25 and Large box = 50

small box = x and large box = x+3

25x+50(x+3)=450

25x+50x+150=450

75x=300

x=4

Large box = 4+3 = 7

Therefore, 4; 7

I hope this helped and have a good rest of your day!

Answer:

1650

Step-by-step explanation:

The shape is a pyramid on top of a prism.

Volume of a pyramid is V = ⅓ Ah, where A is the area of the base and h is the height of the pyramid.

Volume of a prism is V = Ah, where A is the area of the base and h is the height of the prism.

The base of both shapes is a right triangle.  The area is:

A = ½ bh

A = ½ (22) (10)

A = 110

The height of the prism is 6.  The height of the pyramid is 33 − 6 = 27.  The total volume is:

V = (110) (6) + ⅓ (110) (27)

V = 1650

Answer:

On a coordinate plane, a line (y = mx + b) goes through point A(0, 4), then it has point A as y-intercept (the point with x component is 0).  And it goes through B(-2, 0).

Denote that line: y = mx + b

=> m*0 + b = 4 (it goes through A(0, 4))

=> b = 4

=> m*2 + 4 = 0 (it goes through B(-2, 0))

=> m = -2

=> Slope m = 2 and y-intercept (0, 4)

Hope this helps!

:)

Answer:

Slope: 2

y-intercept: 4

Step-by-step explanation:

m = (0-4)/(-2-0) = -4/-2 = 2

y -4 = 2(x - 0)

y = 2x + 4

Answer: D(x) = 2kg/h*x

where x is the number of hours.

Step-by-step explanation:

The information that we have is:

in 5 hours, we can prepare 10kg of dough.

With this, we can find the rate per hour, to do this we find the quotient:

R = 10kg/5h = 2kh/h

This meeans that in one hour, we can make 2kg of dough.

Then, in x hours, we can make x times 2kg of dough, then the equation will be:

D(x) = 2kg/h*x

where x is the number of hours.

Answer:

multiply 12*7

Step-by-step explanation:

Answer:

84 m²

Step-by-step explanation:

12 times 7 (for a rectangle)

Answer:

a. [tex]f^-^1(x)=\frac{x}{4} +3[/tex]

b. [tex]f(-9)=-48[/tex]

c. [tex]f^-^1(-9)=\frac{3}{4}[/tex]

Step-by-step explanation:

In a, the -1 means inverse of f(x). To find the inverse, you rewrite the equation in terms of x and y. You replace the x with y and y with x. Then you solve for y.

[tex]f^-^1(x)=4x-12[/tex]

[tex]y=4x-12[/tex]

[tex]x=4y-12[/tex]

[tex]x+12=4y[/tex]

[tex]\frac{x}{4} +3=y[/tex]

[tex]f^-^1(x)=\frac{x}{4} +3[/tex]

In b, all you have to do is plug in -9 into f(x).

[tex]f(9)=4(9)-12[/tex]

[tex]f(9)=-48[/tex]

In c, you plug in -9 into inverse function f.

[tex]f^-^1(-9)=\frac{3}{4}[/tex]

Hello there!

$500 invested at 4% compounded annually for 10 years

time: 10 years

compound: annually

interest: 4%

y = 500(1.04)^10

1.04^10 = 1.48

500 x 1.48 = 740

Value after 10 years: $740

Answer:

  $740.12

Step-by-step explanation:

The amount is multiplied by 1.04 each year, so after 10 years, the balance will be ...

  $500(1.04^10) = $740.12

Answer:

  37.4 ft^2

Step-by-step explanation:

The area of the parallelogram is given by ...

  A = bh = (8 ft)(7 ft) = 56 ft^2

The area of the right triangle is given by ...

  A = (1/2)bh = (1/2)(3 ft)(4 ft) = 6 ft^2

The area of the circle is given by ...

  A = πr^2 = π(2 ft)^2 = 4π ft^2 ≈ 12.6 ft^2

__

The shaded area is the area of the parallelogram less the areas of the unshaded triangle and circle:

  (56 ft^2) -(6 ft^2) -(12.6 ft^2) = 37.4 ft^2 . . . . shaded area

Answer:

C: Lines r and s and lines t and u must be parallel.

Step-by-step explanation:

The true statement is (c) Only lines r and s must be parallel.

From the figure, we can see that:

Lines r and s point in the same direction, while lines t and u point in the same direction

If angle 8 = angle 10 and angle 1 = angle 7, then it means that:

Lines r and s must be parallel.

Line t and u may or may not be parallel.

Hence, the true statement is (c) Only lines r and s must be parallel.

Read more about parallel lines and transversal at:

https://brainly.com/question/26365887

Step-by-step explanation:

Refer The attachment.

Answer:

(a) In attachment

(b) x = y² - 2y - 1,    −2 ≤ y ≤ 4

Step-by-step explanation:

(a)

The graph of the given parametric equation is given in the attachment.

The direction in which the curve is traced as t increases, is indicated by black arrows.

(b)

To eleminate the parameter t, we simultaneously solve both the equations.

So, we have the equations:

x = t² - 2   ----- equation (1)

y = t + 1   ----- equation (2)

So, from equation (2), we have:

t = y - 1

Substituting this in equation (1), we get:

x = (y - 1)² - 2

x = y² - 2y + 1 - 2

x = y² - 2y - 1

Now, for limits of y, we use equation (2)

For initial limit, t = -3

y = - 3 + 1 = - 2

For final limit, t = 3

y = 3 + 1 = 4

Therefore, the final relation after eliminating t is:

x = y² - 2y - 1,    −2 ≤ y ≤ 4

The Cartesian equation of the curve after eliminating the parameter t is expressed below.

[tex]x=y^2-2y-1[/tex]

For, the y values of, [tex]-2 \leq y \leq 4[/tex]

The parametric equation is the type of equation  in which the variable which is in depended on on is known as parameter. The dependent function in this equation is defined as the continuous function of that variable.

The first equation given in the problem is,

[tex]x = t^2 - 2 \\t^2=x+2[/tex]                    

The second equation given in the problem is,

[tex]y = t + 1\\t=y-1[/tex]

Put the values of t in the modified first equation as,

[tex](y-1)^2=x+2\\y^2+1-2y-2=x\\x=y^2-2y-1[/tex]

The values of t are between -3 to 3.

[tex]-3 \leq t \leq 3[/tex]

The value of t is -3 then the value of y will be -2 and when the value of t is 4 then the value of y will be 4 from equation 2.

Hence, the Cartesian equation of the curve after eliminating the parameter t is expressed below.

[tex]x=y^2-2y-1[/tex]

For, the y values of, [tex]-2 \leq y \leq 4[/tex]

Learn more about the parametric equation here;

https://brainly.com/question/21845570

Answer:

Not enough evidence to reject Null hypothesis

Step-by-step explanation:

Solution:-

- A comparative study for bacterial growth in manual and electronic faucets is made.

- It is observed that there is a higher growth in electronic faucets due to slower flow rates, i.e electronic faucets are not thoroughly flushed; hence, giving more resident time for the scaled bacteria to grow.

- It is known that 15% of cultures from older faucets were tested positive for the Legionella bacteria.

- A study at John Hopkins was conducted on a sample n = 20 electronic faucets with the probability of bacteria growing in a faucet is 0.15.

- We will conduct a hypothesis for at-least half proportion of electronic faucets have cultured bacteria.

- State the hypothesis for the proportion of electronic faucets culturing Legionella bacteria:

        Null Hypothesis:  P = 0.15

        Alternate hypothesis: P > 0.15    

- To determine the test statistics for the study conducted at John hopkins. We had a sample size of n = 20, and the probability for a bacteria to grow in a faucet is 0.15.

- Denote random variable, X: The number of electronic faucets culturing Legionella bacteria.

- Since, the probability for a bacteria to grow in a faucet is independent for each new faucet. We will assume the RV " X " to follow binomial distribution with probability of success 0.15:

                      X ~ Bin ( 20 , 0.15 )                  

- We are to determine that at-least half of the sample is subjected to the said bacteria. This is the probability of P ( X ≥ 10 ).

- The pmf for a binomially distributed random variable X is given below:

                     [tex]P ( X = r ) = n_C__r * ( p(success) )^r * ( p (fail) )^(^n^-^r^)[/tex]

Where,

            p ( success ) = 0.15

            p ( fail ) = 1 - p ( success ) = 1 - 0.15 = 0.85

- Use the pmf to determine the required test statistics:

[tex]P ( X \geq 10 ) = 1 - P ( X \leq 9 )\\\\P ( X \geq 10 ) = 1 - [ (0.85)^2^0 + 20*(0.15)*(0.85)^1^9 + 20_C_2 (0.15)^2*(0.85)^1^8 +\\\\ 20_C_3 (0.15)^3*(0.85)^1^7 + 20_C_4 (0.15)^4*(0.85)^1^6 + 20_C_5 (0.15)^5*(0.85)^1^5+\\\\ 20_C_6 (0.15)^6*(0.85)^1^4 + 20_C_7 (0.15)^7*(0.85)^1^3 + 20_C_8 (0.15)^8*(0.85)^1^2 + \\\\ 20_C_9 (0.15)^9*(0.85)^1^1\\\\\\P ( X \geq 10 ) = 1 - [ 0.03875 + 0.13679 + 0.22933 + 0.24282 + 0.18212 + 0.10284 + \\\\ 0.04537 + 0.01601 + 0.00459 + 0.00108 ]\\\\[/tex]

[tex]P ( X \geq 10 ) = 1 - [ 0.997 ] = 0.003[/tex]

- The probability that 10 or more electronic faucets is found to have Legionella bacteria growing is 0.003              

- The test proportion of 10 and more electronic faucets have culturing bacteria is p = 0.003.

- Assuming normality of the population, the Z-statistics would be:

                  [tex]Z-test = \frac{ (p - P) \sqrt{n} }{\sqrt{P*(1 - P )} } \\\\Z-test = \frac{ (0.003 - 0.15) \sqrt{20} }{\sqrt{0.15*(0.85)} } \\\\Z-test = -1.84109[/tex]

- If we were to test the claim to 90% level of confidence:

                  significance level (α) = 1 - CI = 1 - 0.9 = 0.1

- The rejection region Z-critical is defined by a right-tail:

                 [tex]Z-critical \geq Z_\alpha \geq Z_0_._2\\\\Z-critical \geq 1.28[/tex]    

- Compare the test statistics with the rejection criteria defined by the Z-critical:

                Z-test < Z-critical

                -1.84 < 1.28

Conclusion:

There is not enough evidence that the probability of Legionella bacteria growing in electronic faucets is greater than 15%.

Answer:

  03829

Step-by-step explanation:

A suitable calculator is useful for this.

Answer:

82.1

Step-by-step explanation:

So the circumference of the whole circle is 46π.

A quarter of that is 11.5π.

11.5π ≈ 36.1283155163

Simplify that to 1 decimal point: 36.1

Then you add 46 to that.

36.1 + 46 = 82.1

Answer:

  x = -4

Step-by-step explanation:

The equation of a vertical line in standard form is ...

  x = constant

In order for this line to go through the point with x-coordinate -4, the constant must be -4:

  x = -4

Answer:

$638.14

Step-by-step explanation:

Our equation is [tex]p*(1+x)^{t}[/tex], with p being the starting amount, x being the interest rate, and t being the time. Plugging our variables in, we get

[tex]500*(1+0.05)^{5}[/tex] = around 638.14

Josh will receive $638 at the end of the term.  

Josh invests $500 in a 5-year fixed interest savings bond that pays 5% per annum,

Cost price is that price for buyer which he pays to seller for an object or product.

Principle amount = $500
Rate = 5 %
Tenure = 5 years

Amount = principle (1+R)^tenure

= 500 (1+5/100)^5
= $638

Thus, Josh will receive $638 at the end of the term.  

Learn more about cost price here:
https://brainly.com/question/11027396

#SPJ2

Answer: on edge i got D,   sq rt 13-sq rt 11

Step-by-step explanation:

Answer:

d

Step-by-step explanation:

edge

The right answer is No solution.

Look at the attached picture

Hope it will help you

Answer:

it is a

Step-by-step explanation:

its the only possible answer. :)

let me know if i am wrong!

Step-by-step explanation:

To randomly pick the 10 people needed in the sample, it can be done this way

1. Define the population: in this case, the total population is 280 and expressed as N and since we are interested in everyone in the neighborhood with no exclusion, our sampling frame is thus 280 people.

2. Choose your sample size: As given in the question, our sample size is to randomly pick 10 people expressed as n.

3. List your population and then assign numbers to each unit in the population: Getting the list of all 280 people in the population and then assigning numbers from 1 to N - in this case 1 - 280.

4. Then find random numbers using the random number table to help select your 10 people sample making them a representative of the population in residence.

Step-by-step explanation:

Square root 8 = 2 square root 2

Answer:

I think it's true. hope this helps!!