Name two properties used to evaluate 7 ∙ 1 – 4

Answer:

(C) 20 Hours

Step-by-step explanation:

Answer:

105,000

Step-by-step explanation:

I'd the scale is 1 : 50,000, you would first take the 2.1km and multiply it by your 50,000. This will put your answer to scale coming in at 105,000 km on the map

Answer:

Just look at the other answer

Step-by-step explanation:

The algebraic formula that represents the situation of the age difference between Fatimah and Nadia is x + 3 = y, where x, y > 0 and y > x.

Herein we have a situation where two people have different ages, Fatimah has an age such that she is 3 years younger than Nadia. Let be x and y variables that respesent the ages of Fatimah and Nadia, respectively. In summary, the word problem can be reduced into the following algebraic expression:

y - x = 3 (Expression that represents age difference between Fatimah and Nadia)

x + 3 = y, where x, y > 0 and y > x. (1)

The algebraic formula that represents the situation of the age difference between Fatimah and Nadia is x + 3 = y, where x, y > 0 and y > x.

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Answer:

24.269

Step-by-step explanation:

Answer:

There is not enough evidence to support the claim that drug is effective at 1%

Step-by-step explanation:

For this we use the pored test as we have dependent test;

Difference :

10,5,-5,3,-3,4,2,-3,0,10,8,-2,3,-2,5,5,4,0

Hypothesis :

H0 : μd = 0

H0 : μd ≠ 0

The mean of d, dbar = Σd / n = 44 / 18 = 2.44

The standard deviation, Sd = 4.45 (using calculator)

The test statistic, T : dbar / (Sd/√n)

T = 2.44 / (4.45/√18)

T = 2.44 / 1.0488750

T = 2.326

Degree of freedom, df = n - 1 ; 18 - 1 = 17

The Pvalue = 0.0326

α = 0.01

Since Pvalue < α ; we fail to reject H0

Answer:

brainliest???

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there are 6 a's in it ^

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i hope you have an amazing day and much love!!!!  mwah

(a) The probability that a randomly selected customer spends less than 65 minutes at the gym is 0.4013. (b) The expected value and standard deviation (standard error) of the sample mean of the time spent at the gym is 2.857 minutes

a) The probability that a randomly selected customer spends less than 65 minutes at the gym is calculated using the standard normal distribution formula.

z = (x - μ) / σ

where,μ = 70 minutes, σ = 20 minutes, x = 65 minutes

Substituting the given values, we get

z = (65 - 70) / 20

z = -0.25

Using a standard normal table or calculator, the probability that a randomly selected customer spends less than 65 minutes at the gym is 0.4013.

b) The standard deviation (standard error) of the sample mean can be calculated using the formula:

SE = σ/√n

where,σ = 20 minutes, n = 49

Substituting the given values, we get

SE = 20/√49

SE = 2.857 minutes

Therefore, the expected value and standard deviation (standard error) of the sample mean of the time spent at the gym is 2.857 minutes, respectively.

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Na, didn't help me at all...

Answer:

1.75 per product

Step-by-step explanation:

Answer:

112

Step-by-step explanation:

You would multiply 8 by 14 dollars because your finding the price per product Pepsi bottle so your answer would be 112 dollars.

Answer:

Number of cupcakes = 2

Number of cookies = 5

Step-by-step explanation:

Let \(x\) denotes the number of cupcakes and \(y\) denotes the number of cookies.

Abigail bought $11.25 worth of cupcakes and cookies such that each cupcake costs $3.75 and each cookie costs $0.75.

\(3.75x+0.75y=11.25\)

At \(x=0;\) \(0.75y=11.25\)

\(y=\frac{11.25}{0.75} =15\)

At \(y=0;3.75x=11.25\)

\(x=\frac{11.25}{3.75}=3\)

So, plot the points \((0,15)\,,\,(3,0)\)

Also,

Abigail bought a total of 7 cupcakes and cookies altogether.

\(x+y=7\)

At \(x=0;0+y=7\)

\(y=7\)

At \(y=0;x+0=7\)

\(x=7\)

So, plot points \((7,0)\,,\,(0,7)\)

From the graph, solution is \((2,5)\)

Number of cupcakes = 2

Number of cookies = 5

Answer:

The P-value you would use to test the claim that the population mean of  pencils produced in that factory have a mean length equal to 18.0 cm is 0.00736.

Step-by-step explanation:

We are given that a quality control specialist at a pencil manufacturer pulls a random sample of 45 pencils from the assembly line.

The pencils have a mean length of  17.9 cm. Given that the population standard deviation is 0.25 cm.

Let \(\mu\) = population mean length of  pencils produced in that factory.

So, Null Hypothesis, \(H_0\) : \(\mu\) = 18.0 cm     {means that the population mean of  pencils produced in that factory have a mean length equal to 18.0 cm}

Alternate Hypothesis, \(H_A\) : \(\mu\neq\) 18.0 cm     {means that the population mean of  pencils produced in that factory have a mean length different from 18.0 cm}

The test statistics that will be used here is One-sample z-test statistics because we know about the population standard deviation;

                           T.S.  =  \(\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }\)  ~ N(0,1)

where, \(\bar X\) = sample mean length of pencils = 17.9 cm

           \(\sigma\) = population standard deviation = 0.25 cm

           n = sample of pencils = 45

So, the test statistics =  \(\frac{17.9-18.0}{\frac{0.25}{\sqrt{45} } }\)  

                                    =  -2.68

The value of z-test statistics is -2.68.

Now, the P-value of the test statistics is given by;

         P-value = P(Z < -2.68) = 1 - P(Z \(\leq\) 2.68)

                      = 1- 0.99632 = 0.00368

For the two-tailed test, the P-value is calculated as = 2 \(\times\) 0.00368 = 0.00736.

Answer:

B. The range is the same for both classes

Answer:

C. The mean is the same for both classes,

Step-by-step explanation:

C. is true because the mean of marks of both classes is 94

Answer:

1st q answer is f(x) is one- to -one function and 2nd q answer is 2

Answer:

Step-by-step explanation:

Let f(x) = y

y = 2x - 3

x = y + 3 / 2

inverse of f(x) = x + 3 / 2

f [g(2)]

f [2+3/2]

f [5/2]

(2×5/2)-3

5-3

= 2

Answer:

It's a, 4

Step-by-step explanation:

Answer:

a. y=x^2

Step-by-step explanation:

desmos graphing calculator

The inverse of the given matrix does not exist. To determine if the inverse of a matrix exists, we need to check if the matrix is invertible, which is equivalent to checking if the matrix has a nonzero determinant.

The given matrix is a 2x2 matrix with elements 4, 5, 7, and 9. To calculate the determinant, we multiply the diagonal elements and subtract the product of the off-diagonal elements. In this case, the determinant is (4 * 9) - (5 * 7) = 36 - 35 = 1. Since the determinant is nonzero, we conclude that the matrix is invertible. However, to find the inverse of the matrix, we need to calculate the matrix of cofactors, transpose it, and divide by the determinant.

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The solution for this system of equation will be \(x=4, y=-3.\)

We will solve the given system of equation by the method of substitution. Now we label the equations as  \(2x+y=5....(i)\) and \(-3x-5y=3....(ii)\).

Now from equation \((i)\) we will find the value of \(y\) which is \(5-2x\). Then we will substitute the value of \(y\) in equation \((ii)\).

So, \(-3x-5\times(5-2x)=3\)

⇒ \(-3x-25+10x=3\)

⇒ \(7x-25=3\)

⇒ \(7x=28\)

\(\therefore x =\frac{28}{7}=4....(iii)\)

Now we will take the value of \(x\) from equation equation \((iii)\) and substitute in equation \((i)\) to get the value of \(y\).

So, \((2 \times 4)+y=5\)

⇒ \(8+y=5\)

⇒ \(y=8-5\)

\(\therefore y=3\)

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How does cellular respiration help maintain homeostasis in animals?

Answer: Cellular respiration helps animals maintain homeostasis by breaking down glucose to produce ATP, which is the energy currency of the cell. ATP is necessary for many cellular processes that help maintain homeostasis such as active transport and protein synthesis.

Explain why cells separate and expel waste.

Answer: Cells separate and expel waste to prevent the accumulation of toxic substances that can disrupt cellular function and lead to disease. The waste products are transported out of the cell and into the bloodstream where they are filtered and excreted by organs such as the kidneys.

Why do cells in organisms such as animals reproduce?

Answer: Cells in organisms such as animals reproduce to replace damaged or dying cells, and to enable growth and development. Reproduction ensures that the organism maintains the proper balance of cells and that there is enough tissue to perform necessary functions.

Explain how plant cells use photosynthesis to maintain homeostasis?

Answer: Plant cells use photosynthesis to maintain homeostasis by converting light energy into chemical energy in the form of glucose. This glucose is then used to produce ATP, which is necessary for cellular processes such as active transport and protein synthesis. Additionally, plants use photosynthesis to produce oxygen, which is necessary for respiration.

I hope this helps :)

Answer:

0.6

Step-by-step explanation:

I used 30 60 90 triangle.

Answer:

Here u go! :)

Step-by-step explanation:

10:20, 15:25, 20:30 etc..

Hope this helps you! xx

Answer:

10:20, 15:30, 20:40, 25:50

Step-by-step explanation:

Recall that raising a power to another power requires multiplying the exponents. Therefore:

(5x^-4)^2 = 5^2 (x^-4)^2

To simplify (x^-4)^2, we use the power rule of exponents which states that when we raise a power to another power, we multiply the exponents. Therefore:

(x^-4)^2 = x^(-4 x 2) = x^-8

Recall that x^-n is equivalent to 1/x^n. Therefore:

x^-8 = 1/x^8

Substituting this back into the original expression, we have:

(5x^-4)^2 = 5^2 (x^-4)^2

= 25 x^-8

= 25 / x^8

Thus, the expression (5x^-4)^2 written using only positive exponents is 25 / x^8.

Answer:

v + u - 4

Step-by-step explanation:

The mean and standard deviation for the number of defective bolts in a total of 400 bolts is 40 and 6.32 (approx), respectively.

The mean and standard deviation for the number of defective bolts in a total of 400 bolts if the probability of defective bolt is 0.1 can be calculated using Poisson distribution.

Poisson distribution is used to predict the number of events that occur over a specified interval of time when the probability of an event occurring is known.

The formula for calculating the mean (μ) and standard deviation (σ) is given as follows:
μ = λσ = √λ
Where λ = np, where n is the number of trials and p is the probability of success.

Here, the probability of a defective bolt is 0.1. So the probability of a non-defective bolt is 0.9. The total number of bolts is 400, so the expected number of defective bolts can be calculated as follows:
μ = λ = np = 400 x 0.1 = 40

The mean number of defective bolts is 40. The standard deviation can be calculated as follows:
σ = √λ = √40 = 6.32 (approx)

The standard deviation is 6.32 (approx).

Therefore, the mean and standard deviation is 40 and 6.32 (approx), respectively.

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Answer:

y+3x=-16

Step-by-step explanation:

y=mx+c

y=-3x+c

-3x is the gradient

-5 is the x value and -1 is the y value

-1=-3x-5+c

-1=15+c

-16=c

y=-3x-16

y+3x=-16

Answer:

259.5

Step-by-step explanation:

8.1*12=97.2
Area of trapiezium = 1/2(b+a)h
(2.8+8.1)=10.9
10.9*3/2=16.35
16.35*2=32.7
2.8*12=33.6
33.6+32.7+97.2=163.5
4*12*2=96
163.5+96=259.5

Second one is correct, The value of -a - c is positive

See, from the number line a = -6 and c = 2

Now, -a - c

= -(-6) -(2)

= +6 - 2 = 4

Which is true...

The amount of work done in compressing the spring from a length of 10 inches to a length of 5 inches is 63.75 in-lb .

In the question ,

it is given that ,

a force of 6 pounds compresses a 16-inch spring 4 inches ;

we know that F = k*x

So , 6 = k*4

k = 6/4 lb/inch .

Work done in compressing spring from 10 inches to 5 inches is

W = ∫₆¹¹ kx dx .

W = k[x²/2]₆¹¹ = (k/2)*[121 - 36] = 85k/2 .

Substituting the value of k = 6/4 , we get

the Work Done is = 85/2 × 6/4 = 63.75 in-lb .

Therefore , the work done in compression is 63.75 in-lb .

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