How do you do 80% off of $120?

Answer:

B

Step-by-step explanation:

(3x+2)(2x-5)

Brainliest?

Answer:

a point indicates a location and has no size

The calculated test statistic z = -0.56 is not in the rejection region, we fail to reject the null hypothesis H0: p = 0.30.

(a) The test statistic for testing the null hypothesis H0: p = 0.30 against the alternative hypothesis Ha: p ≠ 0.30 using the sample proportion p = 0.285 is given by:

z = (p - μ) / (σ / sqrt(n))

where μ = 0.30, σ = sqrt(μ(1-μ)/n) = sqrt(0.30(0.70)/400) = 0.027,

and n = 400.

Substituting the values, we get:

z = (0.285 - 0.30) / (0.027)

z = -0.56 (rounded to two decimal places)

(b) The p-value is the probability of getting a test statistic as extreme as the observed, assuming the null hypothesis is true. Since this is a two-tailed test, we need to find the probability of getting a z-score less than -0.56 or greater than 0.56, given a standard normal distribution.

Using a standard normal table or calculator, we find that the probability of getting a z-score less than -0.56 is 0.2881, and the probability of getting a z-score greater than 0.56 is also 0.2881. Therefore, the p-value is the sum of these probabilities:

p-value = P(z < -0.56 or z > 0.56) = 0.2881 + 0.2881 = 0.5762 (rounded to four decimal places)

(c) The rejection rule using the critical value depends on the level of significance α and the type of test (one-tailed or two-tailed). Assuming a two-tailed test with α = 0.05, the critical values for the test statistic are ±1.96, which are obtained from a standard normal table or calculator.

Therefore, the rejection rule is:

if z ≤ -1.96 or z ≥ 1.96, reject H0.

Otherwise, fail to reject H0.

Since the calculated test statistic z = -0.56 is not in the rejection region, we fail to reject the null hypothesis H0: p = 0.30.

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Answer: Answer D. Between 90 degrees and 180 degrees.

Step-by-step explanation: It isn't quite a 90 degree angle (think of a perfect square) but it's closer to 180 degrees (think of a straight line)

Answer: D

Step-by-step explanation:

Use the process of elimination...

a. 180-360- no

b. 0-45- no

c. 45-90- no

d. 90-180- yes!

Answer:

exact form is 21/2, in decimal form is 10.5 and in mixed fraction is 10 1/2

Step-by-step explanation:

The required value is 21/2 in exact form, in decimal form is 10.5 and in mixed numbers is 10 1/2.

A fraction is defined as a numerical representation of a part of a whole that represents a rational number.

Arithmetic operations can also be specified by the addition, subtract, divide, and multiplying built-in functions.

We have to determine the value of 1/5 of 52 1/2

The required value = 1/5 of 52 1/2

Convert the mixed number into the fraction

The required value = 1/5 × 105/2

Apply the multiplication and reduce into the simplest form

The required value = 21/2

The required value = 10 1/2

Convert the mixed number into a decimal,

The required value = 10.5

Hence, the required value is 21/2 in exact form, in decimal form is 10.5 and in mixed numbers is 10 1/2.

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Temperature of refrigerators - Cannot determine. Horsepower of race car engines - Ratio. Marital status of school board members - Nominal. Ratings of television programs - Ordinal. Ages of children enrolled in a daycare - Interval

The level of measurement for the temperature of refrigerators cannot be determined based on the given information. The temperature could potentially be measured on a nominal scale if the refrigerators were categorized into different temperature ranges. However, without further context, it is not possible to determine the specific level of measurement.

The horsepower of race car engines can be measured on a ratio scale. Ratio scales have a meaningful zero point and allow for meaningful comparisons of values, such as determining that one engine has twice the horsepower of another.

The marital status of school board members can be measured on a nominal scale. Nominal scales are used for categorical data without any inherent order or ranking. Marital status categories, such as "married," "single," "divorced," etc., can be assigned to school board members.

The ratings of television programs, such as "poor," "fair," "good," and "excellent," can be measured on an ordinal scale. Ordinal scales represent data with ordered categories or ranks, but the differences between categories may not be equal or measurable.

The ages of children enrolled in a daycare can be measured on an interval scale. Interval scales have equal intervals between values, allowing for meaningful differences and comparisons. Age, measured in years or months, can be represented on an interval scale.

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OPTION D

log(20x²/y)

is the correct answer

the answer is D!

Step-by-step explanation:

have a nice day!!!

The determinant of 2A^2 if A is 3 × 3 and det(A)=4 is 128.

The Determinant of a matrix when multiplied with any constant is the determinant of the matrix without that constant multiplied to the nth power of the constant, where n is the rank of the matrix.

So, Det(2A²) can be written as 2³× Det(A²)

and we also know if the dimensions of the matrices are the same Det(A × B) is the same as Det(A) × Det(B)

so, further, we can write

Det(2A²)=2³× Det(A)× Det(A)

Also its given that Det(A) = 4

so, putting the value of the given we get,

Det(2A²)=2³× 4 × 4

i.e. Det(2A²) = 128

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Warm Up For each translation of the point (–2, 5), give the coordinates of the translated point. 1. 6 units down (–2, –1) 2. 3 units right (1, 5) For each.

There is two ordered pair greater tan 12 i.e., (2, 8) and (-6,0).

Given,

The equation is :

-5x - 3y = 12

To find the which ordered pair is a solution of above equation.

Now, According to the question:

-5x - 3y = 12

Value is (3, 9) of (x , y)

Substitute in above equation:

-5(3) - 3(9) = 12

-15 - 27 = 12

-42  ≠ 12

Values of (x , y)                                  Equation : -5x -3y = 12

(-5, 5)                                                         = - 10 < 12                                            

(3, -6)                                                         = -33 < 12

(-2, -5)                                                        = -25 < 12

(2, 8)                                                          =  14 > 12

(-6, 0)                                                         = 30 > 12

Hence, There is two ordered pair greater tan 12 i.e., (2, 8) and (-6,0).

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the two siblings at present age are Son = 7 years old Daughter = 21 years old.

Therefore, if it's his child, it should be younger than him. That means both age groups are above 42. The number of one must also be three times the number of the other. 7 * 3 = 21, both of which he is under 42, is your answer.

If the age-group sums are X and Y, and the ratio of each age-group is p:q, then you can find the age of Y using the following formula: Age of Y = ratio of Y / total ratio x total years. Age of Y = q/ (p+q) x A.

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Occupants are 10 times more likely to be killed in a crash when not buckled in. option c.

Wearing a seatbelt is one of the simplest ways to protect oneself while in a vehicle. When properly worn, it decreases the likelihood of being seriously injured or killed in a collision by as much as 50%. When an individual is not wearing a seatbelt, they are putting their lives at risk. Wearing a seatbelt should be a routine habit whenever an individual sits in a vehicle.

Buckling up is the easiest and most effective way to prevent injuries and fatalities on the road. If drivers, passengers, and children buckle up every time they travel in a vehicle, the likelihood of being killed or injured in a collision is greatly reduced. When occupants of a vehicle do not buckle up, they are 10 times more likely to be killed in a crash. This means that the likelihood of being killed is significantly higher when not wearing a seatbelt.

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Convert from number format to standard form as a decimal multiplied by a power of 10.

step 1

convert 1.5806*10rais to 4

Convert to decimal notation

1.5806*10^4

The exponent is 4, making it 10 to the power of 4. As the exponent is positive, the solution is a number greater than the origin or base number. To find our answer, we move the decimal to the right 4 time(s)

1.5806 ->15806

step 2

final result

15806

Simplify the expression

1.581*10^4

Simplify exponents and square roots

1.581*10^4

10 ^4 = 10 × 10 × 10 × 10 = 10,000

1.581*10000

Perform any multiplication or division, from left to right:

1.581*10000

15806

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Answer:

b

Step-by-step explanation:

it doesnt

run through the origin

The number of trees more than 10m tall but not more than 20m tall is 18 trees.

0 < h ≤ 5 = 5

height greater than 0m less than or equal to 5m

5 < h ≤ 10 = 9

height greater than 5m less than or equal to 10m

10 < h ≤ 15 = 13

height greater than 10m less than or equal to 15m

15 < h ≤ 20 = 5

height greater than 15m less than or equal to 20m

20 < h ≤ 25 = 1

height greater than 20m less than or equal to 25m

The number of trees that are more than 10m tall but not more than 20m tall are;

10 < h ≤ 15 = 13

15 < h ≤ 20 = 5

So,

13 + 5 = 18 trees

Therefore, the total number of trees which are 10m tall but not more than 20m tall is 18 trees.

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Answer:

The answer is C.

Step-by-step explanation:

ur welcome

Answer:

Step-by-step explanation:

The tank also has a L = W = 30.7 cm

The amount of water it can hold is V = s^3

s = 30.7

V = 30.7^3

V = 28934.4 cm^3

If you want a different set of units, you are going to have to specify what they are.

Answer:30.7

Step-by-step explanation:

Wsp

Answer:

490 newtons

Step-by-step explanation:

Answer:

x = 24, y = 15

Step-by-step explanation:

Find attached the step-by-step solution.

Answer:

Step-by-step explanation:

we know that (6x - 7) + (3x - 29) = 180 ---- eq. 1

                                8y + 17 = 6x - 7 -------- eq. 2

find: x and y

solution:

solve x using eq. 1

substitute x = 24 into eq. 2

Answer: 26.6 repeating number or 26 2/3

Step-by-step explanation:

Answer:

the answer is in the picture.. if you need to actually solve the system please tell me and i will send that too

Answer:

20

Step-by-step explanation:

The formula you have given (SS₁ + SS₂) / (n₁+ n₂) is actually the formula for the unweighted average of the variances, which is not appropriate when the sample sizes and variances are different between the two samples.

The formula for pooled variance is:

pooled variance = (SS₁+ SS₂) / (df₁ + df₂)

where SS₁ and SS₂ are the sum of squares for the two samples, df₁ and df₂ are the corresponding degrees of freedom, and the pooled variance is the weighted average of the variances of the two samples, where the weights are proportional to their degrees of freedom.

Note that the denominator is df₁ + df₂ not n₁+ n₂. The degrees of freedom take into account the sample sizes as well as the number of parameters estimated in

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Answer:

it will be the first the 5th the 2nd and the 3rd

The height of the kite is approximately 68.4 ft.

To solve the problem, we can use trigonometry. We know that the string is the hypotenuse of a right triangle, with the height of the kite as one of the legs. The angle of elevation, which is the angle between the string and the ground, is also given. We can use the tangent function to find the height of the kite:

tan(46°) = height / 94

Solving for height, we get:

height = 94 * tan(46°)

Using a calculator, we get:

height ≈ 68.4 ft

Therefore, the height of the kite is approximately 68.4 ft.

We use the given angle of elevation and the length of the string to set up a right triangle with the height of the kite as one of the legs. Then, we use the tangent function to relate the angle to the height of the kite. Finally, we solve for the height using a calculator and round to the nearest tenth as requested.

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Complete Question:

A kite flying in the air has a 94-ft string attached to it, and the string is pulled taut. The angle of elevation of the kite is 46 °. Find the height of the kite. Round your answer to the nearest tenth.

Answer:

100

Step-by-step explanation:

I multiplied 20, 10, and 1/2

20*10=200 Then you do 200*1/2=200 divided 2 and get 100

HOPE THIS HELPS! =)

The angle between the vectors can be found using the dot product. The formula is θ= |A| =√(x12 + y12 + z12) The angle between the vectors -2i + 3j + k and i + 2j - 4k is approximately 137.8 degrees.

v1 • v2 = (-2i + 3j + k) • (i + 2j - 4k)

= -2 - 6 + 1 = -7

|v1| = \(\sqrt{((-2)^2 + 3^2 + 1^2)}\)

=\(\sqrt{(4 + 9 + 1)}\)

=\(\sqrt{14}\)

|v2| = \(\sqrt{((1)^2 + 2^2 + (-4)^2)}\)

= \(\sqrt{(1 + 4 + 16) }\)

= (\(\sqrt{21}\)

θ= |A| (-7/\(\sqrt{14}\)\(\sqrt{21}\))

=  |A| (-7/21*14)

=  |A|(-7/294)

= 137.8 degrees

The angle between two vectors can be found using the dot product formula. This formula isθ= |A| =√(x12 + y12 + z12). In the case of the vectors -2i + 3j + k and i + 2j - 4k, this formula can be used to find the angle between them. The dot product of the two vectors is -2 - 6 + 1 = -7. The magnitude of the first vector, |v1|, can be found using the Pythagorean theorem, which is

\(\sqrt{((-2)^2 + 3^2 + 1^2)}\)

= \(\sqrt{(4 + 9 + 1)}\)

= \(\sqrt{14}\).

The magnitude of the second vector, |v2|, can be found using the Pythagorean theorem, which is

\(\sqrt{((1)^2 + 2^2 + (-4)^2)}\)

= \(\sqrt{(1 + 4 + 16)}\)

= \(\sqrt{21}\)

Once the dot product and magnitudes are known, the angle between the two vectors can be found using the formula .Therefore, the angle between the two vectors is approximately 137.8 degrees.

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