Please help me out please

Answer:

270

Step-by-step explanation:

The mean is 228 and the standard deviation is 18.

2.3 standard deviations above the mean is:

228 + 2.3×18

228 + 41.4

269.4

Since scores are usually integers, we round up to 270.

Answer:

(x - 5)² + (y + 3)² = 16

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

here (h, k) = (5, - 3) and r = 4, thus

(x - 5)² + (y - (- 3))² = 4², that is

(x - 5)² + (y + 3)² = 16 ← equation of circle

Answer:

5 seconds

Step-by-step explanation:

In order to find the time when it landed, we will have to find the x-intercepts.

Equation given to us : -16t² + 48t + 160

Let's take the GCD, which is -16.

-16( t² - 3t - 10 )

Factoring what's inside the brackets, we get the x-intercepts.

What multiples to -10 but adds up to -3? The numbers are -5 and 2

-16 ( t - 5 ) ( t - 2 )

X-intercepts are t - 5 and t - 2

Which is 5 and 2 seconds. But one of this is an extraneous solution and that is 2.

If we substitute the value of 2 in the equation, we will not get 0.

During the x-intercept, the x has a value and y is 0. If we substitute 5 ans x. we will get y as 0.

Hence, the answer is 5 seconds.

Answer:

The inequality is [tex]0.6x < 12.5[/tex]

The maximum number of days that Diego's father can drive the car without the warning light coming on is 20 days

Step-by-step explanation:

14 gallons-1.5 gallons=12.5 gallons  

we know that

If the remaining fuel is greater than  1.5 gallons Diego's father can drive the car without the warning light coming on  

so

Let

x ----> the number of days

[tex]0.6x < 12.5[/tex] ----> inequality that represent the situation

Solve for x

[tex]x < 12.5/0.6[/tex]

[tex]x < 20.8\ days[/tex]

The maximum number of days that Diego's father can drive the car without the warning light coming on is 20 days

An inequality is similar to an equation in that they both describe the relationship between two expressions.

The inequality represents the number of days Diego's father can drive the car without the warning light coming on is [tex]\rm x<20.8[/tex].

Diego's family car holds 14 gallons of fuel.

Each day the car uses 0.6 gallons of fuel.

A warning light comes on when the remaining fuel is 1.5 gallons or less.

An inequality is similar to an equation in that they both describe the relationship between two expressions.

The inequality represents the number of days Diego's father can drive the car without the warning light coming on is,

The remaining fuel is greater than 1.5 gallons Diego's father can drive the car without the warning light coming on.

Here, x represents the number of days.

Therefore,

The inequality represents the number of days Diego's father can drive the car without the warning light coming on is,

[tex]\rm 0.6x<12.5\\\\x < \dfrac{12.5}{0.6}\\\\x<20.8[/tex]

Hence, The inequality represents the number of days Diego's father can drive the car without the warning light coming on is [tex]\rm x<20.8[/tex].

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Answer:

Choice A is the correct answer

Step-by-step explanation:

[tex]2x\sqrt{2x}[/tex]

Find the attachment below for the explanation

For this case we must indicate an expression equivalent to:

[tex]\sqrt {18x ^ 3} - \sqrt {9x ^ 3} +3 \sqrt {x ^ 3} - \sqrt {2x ^ 3}[/tex]

So, rewriting the terms within the roots we have:

[tex]18x ^ 3 = (3x) ^ 2 * (2x)\\9x ^ 3 = (3x) ^ 2 * (x)\\x ^ 3 = x ^ 2 * x\\2x ^ 3 = (2x) * x ^ 2[/tex]

So:

[tex]\sqrt {(3x) ^ 2 * (2x)} - \sqrt {(3x) ^ 2 * (x)} + 3 \sqrt {x ^ 2 * x} - \sqrt {(2x) * x ^ 2} =[/tex]

Removing the terms of the radical:

[tex]3x \sqrt {2x} -3x \sqrt {x} + 3x \sqrt {x} -x \sqrt {2x} =[/tex]

We simplify adding terms:

[tex]3x \sqrt {2x} -x \sqrt {2x} -3x \sqrt {x} + 3x \sqrt {x} =\\2x \sqrt {2x} + 0 =\\2x \sqrt {2x}[/tex]

Answer:

Option A

Answer:

A) The angles are 30-60-90. The longest leg (hypotenuse) of the triangle is twice the shortest leg. The middle leg is the shortest leg times the square root of 3.

Step-by-step explanation:

The answer choice speaks for itself.

The legs of a 45-45-90 triangle have the ratios 1 : 1 : √2.

The legs of a 30-60-90 triangle have the ratios 1 : √3 : 2.

Clearly, the given leg lengths match the second set of ratios more closely:

10 : 17.32 : 20 ≈ 1 : √3 : 2.

Answer:

169 : 289

Step-by-step explanation:

Since the figures are similar then

linear ratio of sides = a : b, then

ratio of areas = a² : b²

ratio of sides = 52 : 68 = 13 : 17

ratio of areas = 13² : 17² = 169 : 289

Answer:

x = 2

Step-by-step explanation:

2 + 4x = 10

4x = 10 - 2

x = 8

x = 8 ÷ 4

x = 2

Answer:

  151.4496 cm²

Step-by-step explanation:

The area of a trapezoid is found using the formula ...

  A = (1/2)(b1 +b2)h

where b1 and b2 are the lengths of the parallel bases and h is the distance between them. Fill in the numbers and do the arithmetic.

  A = (1/2)(22.2 cm + 8.52 cm)(9.86 cm) = 151.4496 cm²

Answer:

The maximum number of rides is 5

Step-by-step explanation:

Let

x----> the number of rides

we know that

The inequality that represent this situation is

[tex]2.75x\leq 15[/tex]

Solve for x

Divide by 2.75 both sides

[tex]x\leq 15/2.75[/tex]

[tex]x\leq 5.45[/tex]

Round down

The maximum number of rides is 5

Answer:

The maximum number of rides is 5

answer is 5 i took the test

Answer:

yes, 6

Step-by-step explanation:

The given sequence is −34, −28, −22, −16, . . .

We check to see if there is a constant difference among the terms.

[tex]d=-28--34=-22--28=-16--22=6[/tex]

Since there is a constant difference of 6 among the consecutive terms, the sequence is arithmetic.

The correct choice is yes, 6

The answer is C: Three real zeros and 2 imaginary zeros

Answer:  C) 3 real zeros & 2 imaginary zeros

Step-by-step explanation:

Since the function has a degree of 5, then there must be 5 zeros.  

If each of the 3 given zeros crosses the x- axis (which is what happens when it has an odd-numbered multiplicity), then there are 2 zeros missing.

The missing zeros are imaginary.

(3 zeroes × multiplicity of 1) + (2 imaginary)

                  3                         +          2           = 5  [tex]\large\checkmark[/tex]

I used 3,14 for pi since it was only way it made sense based on the answers.

The question probably provided you with this.

If you have any more questions do not hesitate :)

The probability that a point picked at random in the square is in the shaded region will be 86/314. Thus option C is correct.

Probability refers to a possibility that deals with the occurrence of random events.

The probability of all the events occurring need to be 1.

Given:

A circle with a diameter of 20 m is inscribed in a square .

Thus side of square = 20 m

Now, area of square = 20 x 20

                                   = 400 sq m

The radius of circle = 10 m

Area of circle

[tex]A = \pi r^2\\\\A = 3.14 \times 10^2\\\\A = 314 m^2[/tex]

Now, Area of shaded region = Area of the square - an area of circle

Area of shaded region = 400 - 314

                                      = 86

The probability that a point picked at random in the square is in the shaded region will be 86/314. Thus option C is correct.

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Answer:

A. -25° 29' 24"

Step-by-step explanation:

It is easier to talk about this by considering the magnitude of the angle, then applying the sign to the result.

The fractional part, 0.49°, can be multiplied by 60' per degree to get the number of minutes:

0.49° × 60'/1° = 29.4'

The fractional part of this, 0.4', can be multiplied by 60" per minute to get the number of seconds:

0.4' × 60"/1' = 24"

Then the angle is ...

-25.49° = -25° 29' 24"

_____

Alternate solution

You can recognize this is 0.01° less than 25° 30', so is ...

0.01° × 60' = 0.6' = 0.6 × 60" = 36"

When 36" is subtracted from 25.5° = 25° 30', the result is 25° 29' 24". Of course, your angle is negative: -25° 29' 24".

_____

Comment on base-60 arithmetic

In base-10 arithmetic, when you borrow 1 from the next higher place in the number, you are borrowing ten of the current place. For example, when you are doing arithmetic with hundreds, and you borrow 1 from the thousands place, you have effectively borrowed 10 hundreds.

In base-60 arithmetic, when you borrow one from the next higher place, you borrow 60 of the current unit. That is, borrowing one minute gives you 60 seconds. Thus, 30 minutes is the same as 29 minutes and 60 seconds. Subtracting 36 seconds from this value gives 29 minutes and 24 seconds.

The term "borrowing" was used when I learned arithmetic. More recently, I've seen it called "rewriting" the number. I also think of it as "making change": changing a higher unit to an equivalent number of smaller units.

There are 25 marbles: (12 red, 7 yellow, 5 blue, 1 white)

The probability of the first marble being red is 12/25 because there are 12 red marbles still available and no marbles are missing

The probability of the second marble being red is 11/24 because only 11 red marbles are available and 1 marble has already been selected from the pile

The probability of the third marble being red is 10/23 because only 10 red marbles are available and 2 marbles have already been selected from the pile

The probability of the fourth marble being red is 9/22 because only 9 red marbles are available and 3 marbles have already been selected from the pile

Since we are interested in all of these events occurring simultaneously, we must multiply the probability of all 4 events, like so:

[tex] \frac{12}{25} \times \frac{11}{24} \times \frac{10}{23} \times \frac{9}{22} [/tex]

Solving for this we are left with:

[tex] \frac{9}{230} \: \: or \: \: 0.0391[/tex]

Answer:

14 feet below. the deck.

Step-by-step explanation:

That would be (20 + 78 - 85 +103 - 110 )  feet above the ground

= 6 feet above the ground.

That is 20 - 6 = 14 feet below the deck.

Answer:

100.

Step-by-step explanation:

The percentage of children's watches = 100 - 20 - 40 = 100-60

= 40%.

40% = 0.40 as a decimal fraction.

So the number of children's watches

= 0.40 * 250

= 100.

Answer:

[tex]\frac{4}{5}[/tex]

Step-by-step explanation:

Using the Pythagorean identity

sin²x + cos²x = 1, then

sin²x = 1 - cos²x

sinx = [tex]\sqrt{1-cos^2x}[/tex]

note that cosΘ = [tex]\frac{6}{10}[/tex] = [tex]\frac{3}{5}[/tex]

sinΘ = [tex]\sqrt{1-(3/5)^2}[/tex]

        = [tex]\sqrt{1-\frac{9}{25} }[/tex]

        = [tex]\sqrt{\frac{16}{25} }[/tex] = [tex]\frac{4}{5}[/tex]

He would have played the cello for 7 hours and 30 minutes because 4 hours would be 6 hours of the cello and then he only did one more hour so you split 3 in half and that makes it an hour and a half. So the answer is 7 hours 30 minutes

Given that the ratio of piano practice to cello practice for Chase is 2:3, if he practiced the piano for 5 hours, he would have practiced the cello for 7.5 hours.

To find out how many hours Chase spent practicing the cello, we first need to assess the ratio of piano to cello practice. The problem tells us that for every 2 hours practicing the piano, Chase spends 3 hours practicing the cello. So, the ratio of piano to cello practice is 2:3.

If he practiced the piano for 5 hours, the equivalent time spent practicing the cello can be found by setting up a proportion like: (2 hours piano / 3 hours cello) = (5 hours piano / x hours cello), where x is the number of cello practicing hours. Solving this proportion for x gives us x = (5 * 3) / 2 = 7.5 hours.

An interpretation of this result is that for every hour Chase spends practicing the piano, he spends 1.5 hours practicing the cello. Therefore, Chase spent 7.5 hours practicing the cello last week, given that he practiced the piano for 5 hours.

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Answer:

  x² +y² = 14x

Step-by-step explanation:

Making the usual substitution x = r·cos(θ) and r² = x² +y², we can get there this way:

Substitute cos(θ) = x/r:

  r = 14·x/r

Multiply by r:

  r² = 14x

Substitute for r²:

  x² + y² = 14x

_____

The original equation is shown dotted; the rectangular version is shown as a solid line. The graphs are identical.

x2 + y3 = 14x is the soulution of your answer (sorry for bad grammar)

Answer:

65/4 cm³, or 16.25 cm³

Step-by-step explanation:

Here, Volume V = (length)(width)(height).  Those measurements are included here:

V = (1  1/4 cm)(4 cm)(3  1/4 cm), or

V  = (5/4 cm)(4 cm)(13/4 cm)

V  =    (5 cm²(13/4 cm) = 65/4 cm³, or 16.25 cm³

Answer:

B

Step-by-step explanation:

The equation of a circle in standard form is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

To obtain this form use the method of completing the square

Given

x² - 8x + y² - 2y - 8 = 0 ( add 8 to both sides )

x² - 8x + y² - 2y = 8

add ( half the coefficient of the x/y terms )² to both sides

x² + 2(- 4)x + 16 + y² + 2(- 1)y + 1 = 8 + 16 + 1

(x - 4)² + (y - 1)² = 25 → B

Final answer:

The standard form of the given circle equation is (x - 4)^2 + (y - 1)^2 = 25, which is option (B).

Explanation:

To rewrite the given equation of a circle in standard form, we need to complete the square for both x and y terms. The equation is given as:

x² − 8x + y² - 2y - 8 = 0

We organize the equation by grouping x and y terms:

(x² − 8x) + (y ² - 2y ) = 8

To complete the square, we add to each side (½ the coefficient of x) ² for the x-terms and (½ the coefficient of y) ² for the y-terms:

For the x terms: (½ × -8)² = (-4)² = 16. Add 16 to both sides.

For the y terms: (½ × -2)² = (-1)² = 1. Add 1 to both sides.

Our equation becomes:

(x² − 8x + 16) + (y² - 2y + 1) = 8 + 16 + 1

Which simplifies to:

(x - 4)² + (y - 1)² = 25

Therefore, the standard form of the given equation is (x - 4)² + (y - 1)² = 25, and the correct answer from the options is (B).

Answer:

50.8%

Step-by-step explanation:

That is the one my friend and I chose. It is 31/61 when all the stuff is added together and that is put to 50.8 as a percentage..

The coat will cost $54

Answer:

144 π  or 452.4 sq inches, for each dot

Step-by-step explanation:

We are given the perimeter of the circle (24π), and we are asked to find the area of the circle basically.

The Circumference of a circle is given by C = 2 * π * r

while its area is given by A = π r²

So, having the circumference, we can isolate r to use it in the area calculation.

C = 2  * π * r

24π = 2 * π * r  (now dividing both sides by 2π)

12 = r

The radius is 12 inches.

That means the area of one dot is:

A = π r² = π 12² = 144 π sq inches

The amount of blue glass needed for each dot is 144 π  or 452.4 sq inches

Answer: 144

Step-by-step explanation:

Answer:

Option 'B'

Step-by-step explanation:

The law of cosines states that given a triangle with sides a, b, c, then:

[tex]c^{2} =a^{2}+b^{2} -2abcos(y)[/tex] where 'y' is the opposite angle to the side 'c'.

In this case, given that the equation is: [tex]15^{2} =8^{2} + 17^{2} -2(8)(17)cos(y)[/tex] we can clearly see that c=15, and the opposite angle to 'c' is 62 degrees.

The correct option is Option 'B'

ANSWER

B. 62°

EXPLANATION

The cosine rule is given by:

[tex] {b}^{2} + {c}^{2} - 2(bc) \cos(A) = {a}^{2} [/tex]

where A is the angle that is direct opposite to the side length which is 'a' units.

The given relation is:

[tex]8^{2} + {17}^{2} - 2(8)(17) \cos( - ) = {15}^{2}[/tex]

The missing angle should be the angle directly opposite to the side length measuring 15 units.

From the diagram the missing angle is 62°

Answer:

D

Step-by-step explanation:

There are 4 colors to choose from, so use numbers 1-4 to represent each color.

Answer:

11

Step-by-step explanation:

There is a rather simple method to this.

The factor given is ( x - 2 ) and the dividend is ( 2x⁵ - 7x³ - x² + 4x - 1)

To find the remainder, we will take it as x - 2 = 0

We will get x as 2

Now, substitute the value.

2 ( 2 )⁵ - 7 ( 2 )³ - ( x )² + 4 ( 2 ) - 1

2 ( 32 ) - 7 ( 8 ) - ( 4 ) + 8 - 1

64 - 56 - 4 + 8 - 1

8 - 4 + 8 - 1

16 - 4 - 1

16 - 5

11

Hence, the remainder is 11.

The greatest common factor of 8m^3 and 6m^4 is 2m^3. This is found by determining the highest number or term that can divide both terms exactly, considering both the coefficients and the power of the variable.

The question asks for the greatest common factor of the terms 8m3 and 6m4. The greatest common factor (GCF) is the highest number or term that divides both numbers exactly. Ignoring the coefficients (8 and 6), we can easily see that these terms both contain the variable 'm', raised to the powers 3 and 4, respectively.

The rule for dealing with variables when finding the GCF is to take the variable to the power which is the lesser of the two. In this case, that would be m3. Now, looking at the coefficients (8 and 6), the highest number that can divide them both exactly is 2. Therefore, the greatest common factor of 8m3 and 6m4 is 2m3.

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The greatest common factor of 8m³ and 6m⁴ is 2m³, which is found by identifying the shared prime factors and the lowest power of 'm' present in both terms.

To find the greatest common factor (GCF) of 8m³ and 6m³, we need to find the highest power of each prime number and the variable that is contained in both terms. The prime factorization of 8 is 23, and for 6, it is 2 × 3. Since both have at least one factor of 2, we'll use that in our GCF. Additionally, since the lowest power of 'm' that appears in both terms is m3, we will also use that.

The GCF is the product of these shared factors. So, we have:

2 (the common prime factor)

m3 (the lowest power of 'm' in both terms)

Therefore, the GCF of 8m³ and 6m⁴ is 2m³.

Answer:

True

Step-by-step explanation:

we know that

sin(-360°)=sin(360°)=0

therefore

y=sin(-360°)=0