The risk set by the researcher for rejecting a null hypothesis when it is true is called the

The 8th term of this geometric sequence 5,-10,20,-40 = -640.

A geometric sequence is one in which every number is the product of its previous number and a constant ratio.

The first term is taken as a, the constant ratio is taken as r. The n-th term of such a series is given as aₙ = a.rⁿ⁻¹.

In the question, we are asked to find the 8th term of the geometric sequence 5, -10, 20, -40.

The first term (a) = 5.

The constant ratio (r) = -10/5 = -2.

We will find the 8th term using the formula of the n-th term aₙ = a.rⁿ⁻¹.

Therefore, 8th term = 5(-2)⁸⁻¹ = 5 * (-2)⁷ = 5 * (-128) = -640.

The 8th term of this geometric sequence 5,-10,20,-40 = -640.

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Answer:

  0.65 square inch

Step-by-step explanation:

Each triangle has an area given by ...

  A = 1/2bh = 1/2·(0.5 in)(0.4 in) = 0.10 in²

The square base has an area given by ...

  A = s² = (0.5 in)² = 0.25 in²

The total area is that of the square base and 4 triangles:

  S = 0.25 in² + 4×0.10 in² = 0.65 in²

Answer:

0.65 square inch

Step-by-step explanation:

The exact values for sinθ, cscθ, and cotθ given the point (-3, -8) are sinθ = -8/√73, cscθ = √73/-8 (because sinθ and cscθ are negative in the third quadrant), and cotθ = 3/8 (positive since sin and cos signs cancel out).

The question involves finding the values of sinθ, cscθ, and cotθ given a point (-3, -8) on the terminal side of an angle θ. To find these values, we first need to determine the radius (r) of the corresponding right triangle formed by the point (-3, -8) and the origin (0, 0). The radius can be calculated using the Pythagorean theorem:

r = √((-3)2 + (-8)2) = √(9 + 64) = √73

Using the definitions of the trigonometric functions:

Note that θ is in the third quadrant where both sine and cosine are negative; hence, sinθ and cscθ are negative, while cotθ is positive due to both the numerator and denominator being negative.

Answer:

The solutions are:  [tex]x= 3.72, -6.72[/tex]

Step-by-step explanation:

[tex]x^2+ 3x = 25\\ \\ x^2+3x+(\frac{3}{2})^2 = 25 +(\frac{3}{2})^2\\ \\ (x+\frac{3}{2})^2 = 25+\frac{9}{4}\\ \\ (x+\frac{3}{2})^2 =27.25\\ \\ \sqrt{(x+\frac{3}{2})^2} =\pm \sqrt{27.25} \\ \\ x+1.5= \pm \sqrt{27.25} \\ \\ x= -1.5 \pm \sqrt{27.25}\\ \\ x=-1.5+ \sqrt{27.25}=3.72015... \approx 3.72\\ \\ or\\ \\ x=-1.5-\sqrt{27.25} =-6.72015...\approx -6.72[/tex]

So, the solutions are:  [tex]x= 3.72, -6.72[/tex]

Final answer:

The remainder when 5k is divided by 3 is 2. This is because k can be represented as 6n + 1 where n is the quotient, and when 5 is multiplied by k and then divided by 3, after simplifying, only the term +5 contributes to the remainder.

Explanation:

When a positive integer k is divided by 6, the remainder is 1. Thus, we can write k as 6n + 1 where n is a quotient. To find the remainder when 5k is divided by 3, we must first multiply k by 5, resulting in 5(6n + 1) = 30n + 5.

Breaking down 30n + 5, we see that 30n is divisible by 3 since 30 is a multiple of 3. Hence, it will not contribute to the remainder when divided by 3. All that is left to consider is the +5 part. The closest multiple of 3 to 5 is 3 itself, meaning 5 divided by 3 will leave a remainder of 2. Therefore, the remainder when 5k is divided by 3 is 2.

The data in the form of the equation can be written as a + c = 1200 and 7a + 3c = 6400. The correct option is A.

Expression in maths is defined as the collection of numbers variables and functions by using signs like addition, subtraction, multiplication, and division.

Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.

Given that a movie theatre sold 1200 tickets and made $6400 in one night. If an adult ticket costs $7 and a children's ticket costs $3.

The expression in the form of the equation can be written as below,

a + c = 1200

7a + 3c = 6400

The correct system of equations will be option A.

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Answer:

The total number of codes is found with

[tex]P_{n}^{r} =n^{r}[/tex]

This formula is applied when we have to find combinations where the order matters, and each element can be used more than once, as happens with codes, there can be repetitions of numbers.

So, [tex]n[/tex] represents the total number of elements which are 6, and [tex]r[/tex] represents the total digits per code, which are 4.

Replacing these values, we have

[tex]P_{6}^{4} =6^{4}=1296[/tex]

This means there are 1296 possible codes.

Now, if the owner doesn't remember the code, the probability of entering the correct code on the first try would be

[tex]P=\frac{1}{1296}=0.0008 (or \ 0.08\%)[/tex]

This means that it's nearly impossible to enter the right code at once.

The coach's predictions cannot be entirely correct because the sum of the probabilities given by the coach does not equal 1. Therefore, the coach's predictions are not consistent with the rules of probability.

The coach's predictions cannot be entirely correct because the sum of the probabilities of all possible outcomes must equal 1. In this case, the sum of the probabilities given by the coach is 2/9 + 1/2 + 2/5 = 49/90, which is not equal to 1. Therefore, the coach's predictions are not consistent with the rules of probability.

To justify this, we can add up the probabilities of winning, tying, and losing the next game. The correct probabilities should add up to 1 since these are the only possible outcomes.

If we add these probabilities together: 2/9 + 1/2 + 2/5 = 49/90, which is not equal to 1. Therefore, the coach's predictions cannot be entirely correct.

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Answer:

Using [tex]|X-a|=b[/tex]

where a is the center or average and b is the distance from the center or the range

Here, v represents the wind speed.

As per the statement:

Minimum sustained wind speed(A)= 74 miles per hour.

Maximum sustained wind speed(B) = 95 miles per hour.

Use the center and distance to write an absolute value equation:

[tex]\text{Center} = \frac{\text{A+B}}{2}[/tex]

then;

[tex]\text{Center (a)} = \frac{74+95}{2}=\frac{169}{2}=84.5[/tex]

Distance from the center(b)= 95-84.5 = 10.5

then;

[tex]|v-84.5| =10.5[/tex]

Therefore, an absolute value equation that represents the minimum and maximum speeds is,  [tex]|v-84.5| =10.5[/tex]

Answer:

The correct simplification of the given expression  [tex]tan(-x){\times}cos(-x)[/tex] is [tex]-sinx[/tex].

Step-by-step explanation:

The given expression is:

[tex]tan(-x){\times}cos(-x)[/tex]

Now, simplifying the above given expression, we get

=[tex]\frac{sin(-x)}{cos(-x)}{\times}cos(-x)[/tex] (because [tex]tanx=\frac{sinx}{cosx}}[/tex])

=[tex]sin(-x)[/tex]

Also, we know that [tex]sin({-\theta})=-sin{\theta}[/tex], tehrefore teh expression becomes

=[tex]-sinx[/tex]

Hence, the correct simplification of the given expression  [tex]tan(-x){\times}cos(-x)[/tex] is [tex]-sinx[/tex].

Answer:

the correct answer is option D.

Step-by-step explanation:

average rate of change in the graph in interval x = 0 and x = pi/2

when we look into the graph between interval x = 0 and x = pi/2

we can see that on y - axis  

at  x = 0                value of   y = 3   and

at  x = π/2             value of   y = 5  

rate of change = [tex]\frac{change\ in y-axis}{change\ in\ x-axis}[/tex]

                        = [tex]\dfrac{y_2-y_1}{x_2- x_1}[/tex]

                        =[tex]\dfrac{5-3}{\frac{\pi}{4} - 0}[/tex]

                        = 4/π

hence, the correct answer comes out to be 4/π

hence, the correct answer is option D.

Answer:

286.5 degrees

Step-by-step explanation:

We want to change radians to degrees

2 pi radians = 360 degrees

5 radians * 360/ 2 pi

900/pi degrees

286.4788976 degrees

286.5 degrees

Answer: 286.48 degrees

Step-by-step explanation: We are trying to find the number of degrees. The equation to convert radians to degrees radian x 180/π. Plug in 5 for x.

5 x 180/π = 286.48

5 radians is the same as 286.48 degrees.

The distance between the friends changing with the rate of 7√15/4 meter per sec.

Let B represents the position of runner, A represents the position of the friend and C represents the position of centre of the circular track. ( shown  below ),

We need to find: dc/dt

By the cosine law,

[tex]c^2 =a^2+b^2+2abcosC[/tex]

Differentiating with respect to t ( time ),

[tex]2c \frac{dc}{dt}=2absinC \frac{dc}{dt}[/tex]

[tex]\frac{dc}{dt}=\frac{2absinC\frac{dc}{dt}}{2c}[/tex]..(1)

Now, by arc length formula,

Radius( say r ) × angle = arc length ( say l )

r × ∠C= l

Differentiating w. r. t. t,

[tex]r \times \frac{dC}{dt} + \angle C \times \frac{dr}{dt} = \frac{dl}{dt}[/tex]

Here dl/dt=7 m per sec

dr/dt=0

r=110

dC/dt=7/110

Now again , [tex]C^2= a^2+b^2-2abcosC[/tex]

[tex]220^2 = 110^2 + 220^2 -2(110)(220)cosC[/tex]

[tex]48400=12100+48400-48400cosC[/tex]

[tex]-12100=-48400cosC[/tex]

[tex]1/4=cosC[/tex]..(2)

[tex]sinC=\frac{\sqrt{15}}{4}[/tex] ...(3)

From equation (1), (2) and (3),

[tex]dC/dt = \frac{(110)(220)\sqrt{15}/4. 7/110}{220}[/tex]

=7√15/4 meter per second.

Hence, the distance between the friends changing with the rate of 7√15/4 meter per sec.

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When the runner's distance from his friend is same as the distance from the friend to center of the track, the runner is moving in a way that the distance between him and his friend isn't changing. Hence, at those specific moments, their relative speed is zero m/s.

This problem involves the concept of relative velocities in a plane. Since the runner is moving along a circular path with a constant speed of 7 m/s, the runner's speed towards or away from his friend depends on the runner's location on the track. However, when the runner is at a distance of 220 m from his friend (which is also the distance from the friend to the center of the track), the runner is moving perpendicular to the line joining the runner and his friend. This is because, in this particular case, the runner is moving along a tangent to the circle that intersects the friend's location. Therefore, the distance between the friends isn't changing at all during those moments - their relative speed is zero m/s.

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The third side of the triangle is AC = 10 centimeters

A triangle is a plane figure or polygon with three sides and three angles.

A Triangle has three vertices and the sum of the interior angles add up to 180°

Let the Triangle be ΔABC , such that

∠A + ∠B + ∠C = 180°

The area of the triangle = ( 1/2 ) x Length x Base

For a right angle triangle

From the Pythagoras Theorem , The hypotenuse² = base² + height²

if a² + b² = c² , it is a right triangle

if a² + b² < c² , it is an obtuse triangle

if a² + b² > c² , it is an acute triangle

Given data ,

Let the triangle be represented as ΔABC

Now , the measures of the sides of the triangle are

The measure of side AB = 6 cm

The measure of side BC = 8 cm

Now , For a right angle triangle

From the Pythagoras Theorem , The hypotenuse² = base² + height²

On simplifying , we get

The measure of side AC = √ ( AB )² + ( BC )²

The measure of side AC = √ ( 6 )² + ( 8 )²

The measure of side AC = √ ( 36 + 64 )

The measure of side AC = √ ( 100 )

The measure of side AC = 10 cm

Therefore , the value of AC is 10 cm

Hence , the right triangle is solved and the side AC = 10 cm

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Answer:

the songs downloaded in  10 seconds

DEEZNUTS

Step-by-step explanation: