What are the solutions to the quadratic equation 4x^2 = 64?

Answer:

  -2.1x +14.4y

Step-by-step explanation:

Use the distributive property to eliminate parentheses. Then combine like terms.

  (12.7y-3.1x)+5.9y-(4.2y-x)

  = 12.7y -3.1x +5.9y -4.2y +x

  = x(-3.1 +1) +y(12.7 +5.9 -4.2)

  = -2.1x +14.4y

Answer:

120 in or 60in or 60^2

Step-by-step explanation:

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Answer:

The answer is v=12.

Step-by-step explanation:

[tex]\frac{v3}{3} =\frac{36}{3\\}[/tex]

[tex]v= \frac{36}{3}[/tex]

[tex]v=12[/tex]

The solution of v³ = 36 for v will be 3.32.

There are many different ways to define an equation. The definition of an equation in algebra is a mathematical statement that demonstrates the equality of 2 mathematical expressions.

More than one variable may be present inside a linear equation. An equation is said to be linear if the maximum power of the variable is consistently unity.

Given the equation,

v³ = 36

Now,

By taking inverse exponents,

v = [tex]36^{1/3}[/tex]

v = 3.32

Hence "The solution of v³ = 36 for v will be 3.32".

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Answer:

True

Step-by-step explanation:

Since if you use negative number you can determine the length between -3 and 0.

Answer:

[tex](x+3)^{2}+6[/tex]

Step-by-step explanation:

The given expression is:

[tex]x^2+6x+15[/tex]

We have to re-write the given expression in form of perfect square. The above equation can be rewritten as:

[tex](x^2+6x)+15\\\\ =(x^2+2(x)(3))+15[/tex]

The general formula of a perfect square is:

[tex](a+b)^{2}=a^{2}+2(a)(b)+b^{2}[/tex]

Comparing previous two equations we can conclude that:

We have the square of first term(x), we have twice the product of first term(x) and second term(3). The square of second term(3) is missing. We can rewrite the previous equation as:

[tex](x^2+2(x)(3))+9+6\\\\ =(x^2+2(x)(3)+9)+6\\\\ =(x^2+2(x)(3)+3^{2})+6\\\\ =(x+3)^{2}+6[/tex]

This is the required form of the given expression.

Answer:

1-4380   2-219   3-15.44    4-37.1     5-6.13      7-58.67     8-160.33

Step-by-step explanation:

Answer:

KN can be best described as a Diameter, as it is a chord(Line that goes between two distinct points in a circle) and goes through the radius.

An example of a radius would be segment KP or PN.

An example of a chord would be segments KN or NM.

An example of a secant would be line LN

An example of a tangent would be line JL.

Answer:

C) diameter

Step-by-step explanation:

KN is a straight line passing through the centre and not outside the circle, so it's a diameter

Answer: AC : BC = 22 : 33 = 2 : 3

Step-by-step explanation:

Since we have given that

AB = 3x-4

AC= 2x+12

BC = 7x-2

And AB: AC = 1 : 2

and To show : AC : BC = 2 : 3

So, it becomes ,

[tex]\dfrac{AB}{AC}=\dfrac{3x-4}{2x+12}=\dfrac{1}{2}\\\\2(3x-4)=2x+12\\\\6x-8=2x+12\\\\6x-2x=12+8\\\\4x=20\\\\x=\dfrac{20}{4}\\\\x=5[/tex]

So, AC: BC becomes:

[tex]\dfrac{AC}{BC}=\dfrac{3x-4}{7x-2}=\dfrac{2(5)+12}{7(5)-2}=\dfrac{22}{33}=\dfrac{2}{3}[/tex]

Hence, proved.

Step-by-step explanation:

First find x:

AB:AC=1:2

2(3x-4)=2x+12

6x-8=2x+12

4x-8=12

4x=20

x=5

Substitute:

AC=2x+12

=(2x5)+12

=10+12

=22

BC=7x-2

=(7x5)-2

=35-2

=33

22/33=2/3

Therefore AC:BC = 2:3

Answer:

486

Step-by-step explanation:

it multiplies by 3 each time

Answer:

486

Step-by-step explanation:

I just did 6/2 and got three and that was the rate of change so I multiplied 3 to  2 to get 6 and then multiplied 3 again to get 18 and kept going until I got to 162 and multiplied that to 3 to get 486.

To find the length of the slide, you can use trigonometry and the angle of depression. The length can be found using the tangent function, and rounding to the nearest whole number gives an answer of approximately 9 feet.

To find the length of the slide, we can use trigonometry and the angle of depression. We can use the tangent function, which is opposite over adjacent, to find the length of the slide. In this case, the opposite side is the height of the slide (12 feet) and the adjacent side is the length of the slide. So we have:

tan(53 degrees) = opposite/adjacent

tan(53 degrees) = 12/adjacent

To solve for the length of the slide, we can rearrange the equation:

adjacent = 12/tan(53 degrees)

Using a calculator, we can find that the length of the slide is approximately 9 feet when rounded to the nearest whole number.

Answer:

Yes

Step-by-step explanation:

Mrs. Shelby

$3 for  6 muffins

$3 for every 6 muffins 3 X 6 =18

$3...6

$6...12

$9....18

Mrs. Kloske

$9 for 18        

They are equivalent in the sense that the price break down would be the same.

Answer:

4.583 *10^9

Step-by-step explanation:

for scientific notation, the number has to be 1<x<10

so in this case, move the decimal point behind the 4. since there are 3 other non 0 digits behind the 4, write it as 4.583

now count how many spaces there are after the 4 and put that as the exponent for 10

Answer:

4.58 x 106

Step-by-step explanation:

i hope this help

Answer:

 The lower supports are Congruent Rectangles and the area of the two supports is 24 square meters.

The upper arch can be decomposed as one semicircle with radius 6 meters minus a semicircle with radius 3 meters.

The area of the archway is (13.5 π + 24) square meters.

Step-by-step explanation:

See attachment for the firgure,

In order to determine the area of archway = The area of upper support + area of lower support.

As given, the lower support are two congruent rectangles consists of dimension 3 m × 4 m

Therefore, the area of lower support can be written as,

The area of lower support = 3 × 4 + 3 × 4 = 12 + 12 = 24 square m.

Now, the upper support arch can be decomposed as the two concentric semi circles having radius 3 m and 6 m,

Hence, the area of the upper support = Area of semi circle having radius i.e 6 m - Area of semi circle having radius i.e 3 m

=> π6²/2 - π3²/2= 27π/2= 13.5π square m

Therefore, the area of the archway =  (13.5 π + 24) square meters

Answer:

1. congruent rectangles

2. 24

3. 6

4. 13.5

Step-by-step explanation:

Got it right, have a nice day!

Answer: 15,700 is 1/10 of 157,000 (A)

Step-by-step explanation:

The relationship between 15,700 and 157,000 is that 15,700 is 1/10 of 157,000

1/10 × 157,000 = 15,700

A 15,700 is 1/10 of 157,000

= 1/10 × 157,000

= 15700 (Correct)

15700 equals 15700

B 157,000 is 1/10 of 15,700

= 1/10 × 15700 = 1570 (Wrong)

1570 is not equal to 157000

C 15,700 is 1/100 of 157,000

= 1/100 × 157,000 = 1570 (Wrong)

1570 is not equal to 15700

D 157,000 is 1/100 of 15,700

1/100 × 15700 = 157 (Wrong)

157 is not equal to 157000

Answer:

Option C is the right choice where length of the arc is 25/18π.

Step-by-step explanation:

Given:

Length of the radius of the circle, [tex]r[/tex] = 2 unit

Angle between the arc, [tex]\theta[/tex] = 125°

We have to find the arc length.

Let the arc length JL be "a" unit.

Formula to be used:

Arc length = (Circumference times angle ) / 360°

Using the above formula and plugging the values.

⇒ Arc length, JL, 'a' = [tex]2\pi r\times (\frac{\theta}{360})[/tex]

⇒ [tex]a=2\pi r\times (\frac{\theta}{360})[/tex]

⇒ [tex]a=2\pi (2)\times (\frac{125}{360})[/tex]

⇒ [tex]a=4\pi \times (\frac{125}{360})[/tex]

⇒ [tex]a=\frac{4\pi \times 125}{360}[/tex]

⇒ [tex]a=\frac{500\pi }{360}[/tex]

⇒ [tex]a=\frac{50\pi }{36}[/tex]

⇒ [tex]a=\frac{25\pi }{18}[/tex]          ... reducing to lowest term.

So,

The length of the arc JL is 25/18π and option C is the right choice.

Answer:

C = 2

Step-by-step explanation:

9c + 14 = 2c^2 + 9c + 6

-9c                     -9c

14 = 2c² + 6

-6           -6

8 = 2c²

4 = c²

c = 2

The value of c on the circle is 4 or -4.

In geometry, the tangent of a circle is a line that intersects the circle at only one point, known as the point of tangency.

The tangent line is perpendicular to the radius of the circle at that point.

We have,

XY and XZ are tangent on the same circle.

So,

XY = XZ

This means,

2c² + 9c + 6 = 9c + 14

Combining like terms.

2c² + 9c - 9c + 6 - 14 = 0

2c² - 8 = 0

2c² = 8

c² = 8/2

c² = 4

c = √4

c = ±4

Thus,

The value of c is 4 or -4.

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Answer:

389.846

Step-by-step explanation

Sorry if its wrong

Answer:

21.16

Step-by-step explanation:

Starting from the theory we have the following equation:

[tex]fi*P(x<c-1) = 0.99[/tex]

Using the data supplied in the exercise, we have subtracting the mean and dividing by the standard deviation:

[tex]P( z \leq \frac{c-1-12}{3.5}) =0.99/fi[/tex]

solving for "c", knowing that fi is a tabulating value:

[tex]\frac{c-13}{3.5}=0.99/fi\\\frac{c-13}{3.5}=2.33\\c-13=2.33*3.5\\c = 8.155 +13\\c = 21.155[/tex]

therefore the value of c is equal to 21.16

Answer:

The 90% confidence interval for the mean time to graduate with a bachelor’s degree is (4.32, 4.84).

Yes, this confidence interval contradict the belief that it takes 4 years to complete a bachelor’s degree.

Step-by-step explanation:

The (1 - α)% confidence interval for population mean μ, when the population standard deviation is not known is:

[tex]CI=\bar x\pm t_{\alpha/2, (n-1)}\times \frac{s}{\sqrt{n}}[/tex]

The information provided is:

[tex]\bar x=4.58\\s=1.10\\\alpha =0.10[/tex]

Compute the critical value of t for 90% confidence interval and (n - 1) degrees of freedom as follows:

[tex]t_{\alpha/2, (n-1)}=t_{0.10/2, (50-1)}=t_{0.05, 49}=1.671[/tex]

*Use a t-table for the probability.

Compute the 90% confidence interval for population mean μ as follows:

[tex]CI=\bar x\pm t_{\alpha/2, (n-1)}\times \frac{s}{\sqrt{n}}[/tex]

     [tex]=4.58\pm 1.671\times \frac{1.10}{\sqrt{50}}\\=4.58\pm 0.26\\=(4.32, 4.84)[/tex]

Thus, the 90% confidence interval for the mean time to graduate with a bachelor’s degree is (4.32, 4.84).

If a hypothesis test is conducted to determine whether it takes 4 years to complete a bachelor’s degree or not, the hypothesis will be:

Hₐ: The mean time it takes to complete a bachelor’s degree is 4 years, i.e. μ = 4.

Hₐ: The mean time it takes to complete a bachelor’s degree is different from 4 years, i.e. μ ≠ 4.

The decision rule based on a confidence interval will be:

Reject the null hypothesis if the null value is not included in the interval.

The 90% confidence interval for the mean time to graduate with a bachelor’s degree is (4.32 years, 4.84 years).

The null value, i.e. μ = 4 is not included in the interval.

The null hypothesis will be rejected at 10% level of significance.

Thus, it can be concluded that that time it takes to complete a bachelor’s degree is different from 4 years.

Final answer:

The 90% confidence interval for the mean time to graduate ranges from approximately 4.32 to 4.84 years, indicating it may take longer than 4 years to complete a bachelor's degree on average.

Explanation:

To calculate the 90% confidence interval for the mean time to graduate, we'll use the sample mean (Ü), standard deviation (s), and the sample size (n).

The formula for the confidence interval is:

Ü ± (t* × (s/√n))

Where

t* is the t-score that corresponds to the 90% confidence level and n-1 degrees of freedom.

Since our sample size (n) is 50, we have 49 degrees of freedom.

Using a t-distribution table or calculator, we can find the appropriate t* value.

Now, let's use the provided information: Ü = 4.58 years, s = 1.10 years, and n = 50.

Assuming that the t-score (t*) is approximately 1.676 for 49 degrees of freedom at the 90% confidence level, we can compute the margin of error (ME):

ME = 1.676 × (1.10/√50) ≈ 0.26 years

Thus, the 90% confidence interval is:

4.58 ± 0.26 years

This interval ranges from approximately 4.32 to 4.84 years. It suggests that we can be 90% confident that the true mean time for graduates to complete a bachelor's degree is within this range.

The confidence interval does not contain the value of 4 years. Thus, this may indicate that it takes longer than 4 years on average to complete a bachelor's degree, contradicting the belief that it takes exactly 4 years.

Answer:

220 ft^3

Step-by-step explanation:

Assuming a rectangular tank,

V = l*w*h

   = 8*5*5.5

   =220 ft^3

The sample is from the right population, his customers. However, because he is surveying such a small number of people and only asking his best customers (who are probably the most satisfied, or they would not buy so much from him), the results are going to be biased, most likely positive, and not representative of his entire customer base.

No, Because, when to do some sort of analysis (such as this one), you need to take (for example) a Random sample from the population of the problem that is being analyzed.

Mathematical expression is defined as the collection of the numbers variables and functions by using operations like addition, subtraction, multiplication, and division.

Given that;

Pete is conducting a survey to determine his customers’ overall satisfaction about the quality of his company’s products.

Let an example a Random sample from the population of the problem that is being analyzed.

In this example (problem), Pete wants to evaluate overall satisfaction of customers, so he should not send the surveys only to the customers who have purchased the largest number of items, but to the randomly selected customers, in order to obtain representative results of the overall satisfaction.

If he sends the surveys only to the customers who have bought the largest number of items, he will obtain very high satisfaction of customers, as results, of course, and this will not be representative results.

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Answer:

y= (x-2)^2/4-7

Step-by-step explanation:

Answer:

8/8

Step-by-step explanation:

8/8 is equal to one, so it would mean he would get to play his favorite board games for a full hour.

7/8 is only about 50 or so minutes, which is less than an hour.

If Tom chooses 8/8 of an hour, he will get to play longer.

Answer:

t = 16

Step-by-step explanation:

–4(t − 12) + 12 = –4

-12                     -12

-4(t - 12) = -16

/-4             /-4

t - 12 = 4

+12      +12

t = 16

or

–4(t − 12) + 12 = –4

distribute the -4

-4t + 48 + 12 = -4

simplify

-4t + 60 = -4

-60          -60

-4t = -64

/-4     /-4

t = 16

Answer:

64/3

Step-by-step explanation:

By setting up a system of equations based on the given information, we find that Brenda sewed 12 buttons on 28 dresses.

Since there are 90 dresses in all, Brenda would have sewed 8 buttons on some and 12 buttons on the remaining. We can set up a system of equations to solve this. Let's say the number of dresses that have 8 buttons is 'x' and the number of dresses with 12 buttons is 'y'. Hence, we have two equations:

From the first equation, we get x = 90 - y. Substituting this into the second equation, we have 8*(90 - y) + 12y = 784. Solving this yields, y = 28. Therefore, Brenda sewed 12 buttons on 28 dresses.

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Answer:

y=3.61

Step-by-step explanation:

y=k/x

4.75= k/38

(4.75)(38)=k

k=180.5

y=180.5/50

y=3.61

Final answer:

y varies inversely with x, which means y = k/x. With y = 4.75 when x = 38, the constant k equals 180.5.

Hence, when x = 50, y equals 3.61.

Explanation:

If y varies inversely with x, this means the relationship between y and x can be described by the equation y = k/x, where k is a constant. Given that y = 4.75 when x = 38, we can first find the constant k by multiplying y by x:

k = y * x = 4.75 * 38 = 180.5

Now that we have found the constant k, we can use it to find y when x = 50. Using the inverse variation formula again, we have y = k/x:

y = 180.5 / 50 = 3.61

Therefore, when x is 50, y is 3.61.

Answer:

59

Step-by-step explanation:

As far as I know every triangle has to equal 180°

So if you add 98+23 you would get 121

subtract that from 180 and get 59

Hope this helps!

Step-by-step explanation:

sin(2x) + cos(3x)

Use double angle formula sin(2x) = 2 sin x cos x.

Use triple angle formula cos(3x) = 4 cos³x − 3 cos x.

Substitute:

2 sin x cos x + 4 cos³x − 3 cos x

Answer:

x = 11

Step-by-step explanation:

2x - 8 = 14

2x = 22

x = 11

Tell me if I am wrong.

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Answer:

Let that number be 'x'

Now first part of the question tells us that 8 less than twice a number which is"x".

so twice a number would be 2x

then 8 less than would 2x-8

and the given result of the equation is 14

so the equation iis 2x-8=14

2x=14+8

2x=22

x=22/2

x=11 So the number is 11

Hope you find it helpful