Answer:
x = 100/9
Step-by-step explanation:
1) Square both sides.
[tex]9x=100[/tex]
2) Divide both sides by 9.
[tex]x = \frac{100}{9}[/tex]
Decimal Form: 11.111111
Check the answer:1) Let [tex]x = \frac{100}{9}[/tex].
[tex]3\sqrt{\frac{100}{9} } =10[/tex]
2) Simplify [tex]\sqrt{\frac{100}{9} }[/tex] to [tex]\frac{\sqrt{100} }{\sqrt{9} }[/tex].
[tex]3\times\frac{\sqrt{100} }{\sqrt{9} }=10[/tex]
3) Since 10 x 10 = 100, the square root of 100 is 10.
[tex]3\times\frac{10}{\sqrt{9} }=10[/tex]
4) Since 3 x 3 = 9, the square root of 9 is 3.
[tex]3\times\frac{10}{3} =10[/tex]
5) Cancel 3.
10 = 10
How do you decide what numbers to use as the numerator and the denominator in each equivalent fraction to the given decimal?
Answer:
To convert a decimal to an equivalent fraction, we need to first determine the place value of the decimal. For example, a decimal that ends in the tenths place (such as 0.4) has a denominator of 10. A decimal that ends in the hundredths place (such as 0.25) has a denominator of 100.
Once we have determined the denominator, we can convert the decimal to a fraction by placing the digits of the decimal in the numerator and the denominator. For example, 0.4 can be converted to the fraction 4/10. We can simplify this fraction by dividing both the numerator and denominator by their greatest common factor, which in this case is 2. So 4/10 simplifies to 2/5.
In general, to convert a decimal to a fraction, we can follow these steps:
1. Determine the denominator based on the place value of the decimal.
2. Place the digits of the decimal in the numerator and the denominator.
3. Simplify the fraction by dividing both the numerator and denominator by their greatest common factor.
It's important to note that sometimes decimals can be rounded, so the resulting fraction may not be exact. In such cases, we can use approximations or continue to simplify the fraction until we reach a desired level of accuracy.
plum island lighthouse, shines a light from a height of 34 feet with a 2 degree angle of depression. how far out can this light reach into the harbor?
Plum Island Lighthouse can light up the harbor 974.44 feet away from its base.
The angle of depression refers to the angle at which an observer is looking down from an object to a point of reference below. If the angle of depression is increased, the distance from the object to the point of reference decreases. When there is a 2-degree angle of depression, the following formula is used to determine the distance between the observer and the point of reference (in this case, the harbor):tan θ = opposite/adjacent
where θ is the angle of depression, opposite is the height of the object, and adjacent is the distance between the object and the point of reference. Tan 2 = 34/x where x is the distance between the lighthouse and the harbor.tan 2 = 0.03492The angle of depression must be converted to radians to use a calculator.θ = 2π/360 = 0.03491 radians
Therefore,34/x = 0.03492x = 34/0.03492 = 974.44 feet.
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Odero sold a suit for 960 making a loss of 20% for how much would he have sold it to make a profit of 20%
From the given information provided, Odero would have had to sell the suit for 1224 to make a profit of 20%.
If Odero sold a suit for 960 and made a loss of 20%, it means his selling price was only 80% of the cost price. We can use this information to find his cost price:
Cost price = Selling price / (1 - Loss%)
Cost price = 960 / (1 - 0.20)
Cost price = 960 / 0.80
Cost price = 1200
Therefore, Odero's cost price for the suit was 1200.
Now, we need to find the selling price that would give him a profit of 20%. Let's call this selling price S:
Profit% = (Selling price - Cost price) / Cost price × 100
20% = (S - 1200) / 1200 × 100
2 = (S - 1200) / 12
S - 1200 = 24
S = 1224
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Gene expression occurs through transcription and then translation. From the provided list, select all that pertain to transcription. (Check all that apply.) Check All That Apply Creation of mRNA Linking together amino acids Using RNA polymerase Using DNA as a template Reading codons
Gene expression occurs through transcription and then translation. From the given list, select all that pertain to transcription. Transcription is the process of converting DNA into RNA. The following are the items that are included in transcription: Using DNA as a template Using RNA polymerase Creation of mRNA Reading codons The RNA polymerase enzyme is responsible for catalyzing the formation of phosphodiester bonds between nucleotides that have been added to the growing RNA chain.
The RNA polymerase enzyme binds to the promoter region of a gene before unwinding the DNA helix and beginning transcription. In transcription, the DNA template strand is read by RNA polymerase in the 3′-to-5′ direction, but RNA is synthesized in the 5′-to-3′ direction. RNA polymerase reads the DNA template strand in the 3′-to-5′ direction, synthesizes the mRNA transcript in the 5′-to-3′ direction, and produces a new RNA molecule that is complementary to the DNA template strand. Thus, transcription is responsible for creating a single-stranded RNA molecule called messenger RNA (mRNA).Therefore, the correct answer is:
Using RNA polymerase Using DNA as a template Creation of mRNA Reading codons
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what would be the value of the sum of squares due to regression (ssr) if the total sum of squares (sst) is 22.21 and the sum of squares due to error (sse) is 6.89?
The value of the sum of squares due to regression (ssr) if the total sum of squares (sst) is 22.21 and the sum of squares due to error (sse) is 6.89 will be 15.32.
To find the Sum of Squares due to Regression (SSR), we use the formula:
SST = SSR + SSE
Rearranging the equation to obtain SSR, we get:
SSR = SST - SSE
[tex]$\begin{aligned}SSR&= SST - SSE \\&= 22.21 - 6.89 \\&= 15.32\end{aligned}$[/tex]
Therefore, the value of the Sum of Squares due to Regression (SSR) is 15.32, given the Total Sum of Squares (SST) is 22.21 and the Sum of Squares due to Error (SSE) is 6.89.
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ON.4 Find missing angles in quadrilaterals 6V4
O
One angle of a parallelogram measures 70°. What are the measures of the other three angles
in the parallelogram?
Submit
T
Learn with an example
o, and
or Watch a video O
Work it out
Answer:
Hi There the answer for this one would be 20 and 90
Step-by-step explanation:
36. Using the definition in Problem 35, prove that if r1, r2, and r3 are distinct real numbers, then the func- tions e"ıt, eľzt, and eľzt are linearly independent on (-00,00). [Hint: Assume to the contrary that, say, erit: Cje"?! + cze'3' for all t. Divide by e"? to get cze("3=ra) and then differentiate to deduce that eri-ra)t and e("3=r) are linearly depen- (t dent, which is a contradiction. (Why?)] = eri-rot C1 + cze(73–rə) a
To prove that the functions e^(r1*t), e^(r2*t), and e^(r3*t) are linearly independent on (-∞,∞) for distinct real numbers r1, r2, and r3, we will follow the hint provided:
1. Assume to the contrary that e^(r1*t) = C1*e^(r2*t) + C2*e^(r3*t) for all t, where C1 and C2 are constants.
2. Divide both sides of the equation by e^(r1*t) to obtain: 1 = C1*e^((r2-r1)*t) + C2*e^((r3-r1)*t).
3. Differentiate both sides of the equation with respect to t:
0 = C1*(r2-r1)*e^((r2-r1)*t) + C2*(r3-r1)*e^((r3-r1)*t).
4. Now, observe that e^((r2-r1)*t) and e^((r3-r1)*t) are linearly dependent, which is a contradiction, since we know that r1, r2, and r3 are distinct real numbers, and the exponential functions with distinct exponents are linearly independent.Thus, the functions e^(r1*t), e^(r2*t), and e^(r3*t) are linearly independent on (-∞,∞) for distinct real numbers r1, r2, and r3.
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what is the probability of getting all tails? express your answer as a simplified fraction or a decimal rounded to four decimal places.
The probability of getting all tails when flipping a coin three times can be calculated using the multiplication rule of probability. For each flip of the coin, there are two possible outcomes: heads or tails.
Assuming the coin is fair, both outcomes are equally likely, so the probability of getting tails on any one flip is 1/2.
To calculate the probability of getting all tails in three flips, we need to multiply the probabilities of getting tails on each individual flip. Since the flips are independent events (i.e. the outcome of one flip does not affect the outcome of another flip), we can simply multiply the probabilities together:P(all tails) = P(tails on first flip) x P(tails on second flip) x P(tails on third flip)
= (1/2) x (1/2) x (1/2)
= 1/8
Therefore, the probability of getting all tails when flipping a coin three times is 1/8 or 0.125 when expressed as a decimal rounded to four decimal places.
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jordan wants to create an equiangular octagon whose side lengths are exactly the first 8 positive integers, so that each side has a differetn length. how many such octagons can jordan create
There is only one equiangular octagon that Jordan can create with side lengths as the first 8 positive integers.
To create an equiangular octagon with side lengths as the first 8 positive integers, each side must have a different length. The sum of the interior angles of an octagon is 1080 degrees, so each angle in the octagon must measure 135 degrees.
If we arrange the 8 integers in decreasing order, we can label the longest side as a and the remaining sides as b1, b2, b3, b4, b5, b6, in descending order. Then, we must have:
a + b1 + b2 = a + b2 + b3 = a + b3 + b4 = a + b4 + b5 = a + b5 + b6 = a + b6 + b1 = 135 degrees
Simplify each equation, we get:
b1 - b3 = b2 - b4 = b3 - b5 = b4 - b6 = b5 - b1 = b6 - a
Since all the side lengths are different, we can use these equations to find all possible combinations of side lengths. By inspection, we can see that there is only one set of side lengths that satisfies these conditions, namely:
a = 8
b1 = 7
b2 = 6
b3 = 5
b4 = 4
b5 = 3
b6 = 2
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What is the volume of the cone expressed in terms of pi?
a picture 40 cm high by 30 cm wide is to be framed. there will be a mount between the edge of the picture and the frame. this mount will be 6cm wide at the top and sides, and 9cm wide at the bottom. the width of the wood used for the frame is 2 cm. what is the overall height of the framed picture?
The overall height of the framed picture is 89cm in the total.
The mount is 6 cm across the top and sides and 9 cm across the bottom. As a result, the mount's overall height will be:
45 cm = 6 cm (top) + 30 cm (image height) + 9 cm (bottom).
The mount's entire breadth will be:
6 cm (left) + 40 cm (width of the image) + 6 cm (right) = 52 cm
To get the total height of the framed image, multiply the height of the mount by the height of the picture by twice the width of the frame (since the frame goes around all four sides of the picture).
As a result, the overall height of the framed image will be:
45 centimetre plus 40 cm plus 2(2 cm) Equals 89 cm.
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3n^2 can it be in standard form
Answer:
No it can,t be in standard for
An inspector test 15 random samples of 100 microchips from hitech microchips and 15 random samples of 100 microchips from speedy microchips
To ascertain whether there are more faulty microchips across the entire cargo, statistical analysis is required. You can utilise proportional or hypothesis tests.
Based on the presented dot plots, it appears that there are typically more faulty microchips in the samples from Hitech Microchips compared to those from Speedy Microchips. Nevertheless, statistical research would be required to verify whether this tendency is consistent over all 2,000 microchip shipments from each brand.
One method would be to total the defective microchips across all 15 samples and divide by the total number of microchips to determine the percentage of defective microchips in each brand's shipment (2,000).
Instead, a hypothesis test might be performed to see if there is a statistically significant difference in the proportion of faulty microchips between the two brands. This would include comparing sample proportions and taking sample size and variability into consideration.
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When women were finally allowed to become pilots of fighter jets, engineers needed to redesign the ejection seats because they had been originally designed for men only. The ejection seats were designed for men weighing between 150 lb and 201 lb. The weights of women are now normally distributed with a mean of 171 lb and a standard deviation of 39 lb.
(a) If 1 adult female is randomly selected, find the probability that her pulse rate is less than 79 beats per minute.
(b) What is the 75th percentile for pulse rates of females?
(c) What is the probability that a randomly selected female has a pulse rate between 60 and 90 beats per minute?
the probability that a randomly selected female has a pulse rate between 60 and 90 beats per minute is approximately [tex]0.0214 or 2.14%.[/tex]
(a)The probability of the pulse rate being less than 79 beats per minute, but there is no information given about the pulse rate. Please provide the necessary information for me to answer this part of the question.
(b) To find the 75th percentile for pulse rates of females, we need to use the normal distribution table or a calculator to find the z-score corresponding to the 75th percentile, which is 0.674. Then, we can use the formula:
[tex]z = (x - μ) / σ[/tex]
where x is the pulse rate, μ is the mean, and σ is the standard deviation. Rearranging the formula to solve for x, we get:
[tex]x = z * σ + μ[/tex]
[tex]x = 0.674 * 39 + 171[/tex]
[tex]x = 197.186[/tex]
Therefore, the 75th percentile for pulse rates of females is approximately 197 beats per minute.
(c) To find the probability that a randomly selected female has a pulse rate between 60 and 90 beats per minute, we need to standardize the values using the z-score formula:
[tex]z1 = (60 - 171) / 39 = -2.846[/tex]
[tex]z2 = (90 - 171) / 39 = -1.974[/tex]
Then, we can use the normal distribution table or a calculator to find the area under the standard normal distribution curve between these two z-scores:
[tex]P(-2.846 < Z < -1.974) = 0.0214[/tex]
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If you are solving the area of a trapezoid or a triangle, you multiply the base and the height. BUTTTT, I don't know if you divide the "area" by 2 to find the answer because the area solves two next to each other ALWAYS, or you do it depending on how many trapezoids are in the problem.
Answer:
When calculating the area of a triangle, you multiply the base by the height and then divide the result by 2. This is because a triangle is half of a parallelogram or a rectangle, and these shapes have an area equal to base times height. By dividing by 2, you are finding half of the area of the parallelogram or rectangle.
For a trapezoid, you can find the area by taking the average of the bases and multiplying it by the height. So the formula for the area of a trapezoid is A = (b1 + b2)h/2, where b1 and b2 are the lengths of the two parallel bases and h is the height. There is no need to divide the result by 2 because the formula already takes the average of the bases into account.
x^2-3x-40=0 solve for x
Answer:
Step-by-step explanation:
x^2-3x-40=0
x^2-3x=40
2x-6x=40
-4x=40
-4x/4 = 40/-4
x= -10
Answer:
x=8 or x=-5
Step-by-step explanation:
x²-3x-40=0
x²-8x+5x-40=0
x(x-8)+5(x-8)=0
(x-8)(x+5)=0
⇒x=8 or x=-5
If
�
�
=
16
WU=16,
�
�
=
15
UV=15,
�
�
=
18
WV=18,
�
�
=
24
XY=24, and
�
�
=
28.8
ZY=28.8, find the perimeter of
△
�
�
�
△XYZ. Round your answer to the nearest tenth if necessary. Figures are not necessarily drawn to scale.
The perimeter of triangle XYZ is approximately 59.1.
What is law of cosines?
The cosine law is used to determine the third side of a triangle when we know the lengths of the other two sides and the angle between them.
[tex]WU^2 + UV^2 - 2WUUV \ cos(WUV) = WV^2\\\\16^2 + 15^2 - 2(16)(15)\ cos(WUV) = 18^2\\\\cos(WUV) = (16^2 + 15^2 - 18^2) / (2(16)(15)) = 77/120[/tex]
Now we can use the Law of Sines to find the length of side XY:
XY / sin(ZYX) = ZY / sin(XYZ)
XY / sin(180° - WUV - XYZ) = 28.8 / sin(XYZ)
XY / sin(WUV + XYZ) = 28.8 / sin(XYZ)
sin(XYZ) = (28.8 sin(WUV + XYZ)) / XY
We can then use the Law of Cosines to find the length of side YZ:
YZ^2 = XY^2 + ZY^2 - 2XYZY cos(XYZ)
YZ^2 = XY^2 + 28.8^2 - 2XY(28.8 sin(WUV + XYZ) / XY) cos(XYZ)
YZ^2 = XY^2 + 28.8^2 - 57.6 sin(WUV + XYZ) cos(XYZ)
Finally, we can use the Law of Sines again to find the length of side XZ:
XZ / sin(WUV) = YZ / sin(XYZ)
XZ / sin(WUV) = (XY^2 + 28.8^2 - 57.6 sin(WUV + XYZ) cos(XYZ)) / (28.8 sin(XYZ))
XZ = sin(WUV) (XY^2 + 28.8^2 - 57.6 sin(WUV + XYZ) cos(XYZ)) / (28.8 sin(XYZ))
18 + 15 + 26.1 ≈ 59.1
Therefore, the perimeter of triangle XYZ is approximately 59.1.
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While birdwatching, Vicki saw 7 red birds, 9 white birds, and 19 black birds. Johnny saw 9 red birds, 12 blue birds, and 29 brown birds. Estimate how many more birds Johnny saw by rounding all numbers to the nearest ten before adding and subtracting.
Answer:
10
Step-by-step explanation:
7 rounds to 10
9 rounds to 10
19 rounds to 20
so Vicki has 40 birds
9 rounds to 10
12 rounds to 10
29 rounds to 30
so johnny has 50 birds
now subtract 50-40=10
please need full answer asap
Answer:
Step-by-step explanation:
[tex](x+14)^2+x^2=22^2[/tex] (Pythagoras Theorem)
[tex](x^2+28x+196)+x^2=484[/tex]
[tex]2x^2+28x+196=484[/tex]
[tex]2x^2+28x-288=0[/tex]
[tex]x^2+14x-144=0[/tex]
Using quadratic formula,
[tex]x=\frac{-b\pm \sqrt{b^2-4ac} }{2a}[/tex]
[tex]x=\frac{-14\pm \sqrt{(14^2-4\times1\times(-144)} }{2\times1}[/tex]
[tex]=\frac{-14\pm \sqrt{(196+576} }{2}[/tex]
[tex]=\frac{-14\pm 2\sqrt{193} }{2}[/tex]
[tex]=-7\pm\sqrt{193}[/tex]
[tex]=-7\pm13.89[/tex]
[tex]=6.89 ,-20.89[/tex] (-20.89 is not useful...cannot have a negative length for
radius)
Solution: radius is 6.89
9. (06.06 MC)
A student attempted to generate an equivalent expression using the distributive property, as shown below:
2(x+5) = 2x+5
What was the mistake made? (5 points)
1.Incorrect sign was used for the second term
2.2 was not multiplied by 5
3.2 was not multiplied by x
Incorrect sign was used for the first term
Using the distributive property to generate an equivalent expression of 2(x+5) as equal to 2x+5, the mistake the student made was 2. 2 was not multiplied by 5.
What is the distributive property?According to the distributive property, multiplying the sum of two or more addends by a number results similarly as multiplying each addend individually by the number and then adding the products together.
For instance, in the expression, 2(x + 5), the equivalent expression should be 2x + 10 instead of 2x + 5.
Thus, we can conclude that the student erred by failing to multiply 2 by 5 as they multiplied 2 by x, which means that they did not apply the distributive property properly.
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maple has 4 identical loaves of bread that weigh a total of 6.6 pounds how much does 1 loaf of bread weigh
Answer:
1.65 pounds
Step-by-step explanation:
6.6 ÷ 4 = 1.65
Answer:
1.65
Step-by-step explanation:
since all together it weighs 6.6 pounds then 1 = x then you cross multiply after cross multiplying you divide 4 by 6.6. Then x = 1.65
The door is 0. 9 m wide and 2. 1 m high. Each of the four windows is 1. 5 m wide and 1. 2 m high. Work out the total area of the door and the four windows
Answer: The total area for the door is 1.89 and the total area for the windows is 7.2
Step-by-step explanation:
door+ 0.9 x2.1= 1.89 and window= 1.5 x 1.2=1.8 x 4= 7.2
Last sentence was find the volume of the larger pyramid
a)the ratio of the heights of the pyramids is 5:3. b)the volume of the larger pyramid is 23.04 cm³.
what is volume ?
Volume is a measure of the amount of space that a three-dimensional object occupies. It is usually measured in cubic units, such as cubic meters (m³) or cubic centimeters (cm³). The volume of an object can be calculated using different formulas depending on its shape.
In the given question,
a. Let the height of the smaller pyramid be h₁ and the height of the larger pyramid be h₂. Since the two pyramids are similar, their corresponding linear dimensions are in the same ratio as the areas of their bases. Therefore, we have:
(base area of smaller pyramid)/(base area of larger pyramid) = (linear dimension of smaller pyramid)² / (linear dimension of larger pyramid)²
Since the linear dimension is the height in this case, we can substitute the given ratio of the base areas to obtain:
25/9 = (h₁/h₂)²
Taking the square root of both sides, we get:
h₁/h₂ = 5/3
Therefore, the ratio of the heights of the pyramids is 5:3.
b. Since the volume of a pyramid is proportional to the cube of its height, we have:
(volume of smaller pyramid) / (volume of larger pyramid) = (h₁/h₂)³ = (5/3)³ = 125/27
Substituting the given volume of the smaller pyramid, we get:
108 / (volume of larger pyramid) = 125/27
Solving for the volume of the larger pyramid, we obtain:
volume of larger pyramid = (27/125) * 108 = 23.04 cm³ (rounded to two decimal places)
Therefore, the volume of the larger pyramid is 23.04 cm³.
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the mean price is 520000 and the stnadard deviation is 58000. at least what percent of homes would you expect to be priced between 418500 and 621500?
It can be stated that a minimum of 90.82% of houses would fall within the price range of $418,500 to $621,500.
The given data are as follows:
Mean price (μ) = $520000
Standard deviation (σ) = $58000
Price range: $418500 to $621500
We are to find the percentage of homes priced between $418500 and $621500.To find the required percentage, we first need to standardize the given range of prices by converting them into z-scores.
The z-score formula is z = (x - μ) / σwhere x is the price, μ is the mean price, and σ is the standard deviation. So, for the lower limit: z₁ = (418500 - 520000) / 58000 = -1.75 And for the upper limit: z₂ = (621500 - 520000) / 58000 = 1.75
Now, we need to find the area under the normal curve between these two z-scores, which represents the percentage of homes priced between $418500 and $621500. To do this, we can use a calculator.
The area between $418500 and $621500 corresponds to the area between z₁ and z₂ on the standard normal distribution curve. The area between z₁ and z₂ is 0.9082 (rounded to 4 decimal places).
Therefore, we can say that at least 90.82% of homes would be priced between $418500 and $621500.
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if the probability of an event is 75 97 75 97 , what is the probability of the event not happening?
Answer: 0%
Step-by-step explanation:
It's impossible for it to be different than 75 or 97
Find the first four terms of the sequence given by the following.
(please explain bc i dont know how to do this :( )
The first four terms of the sequence are 3, -15, 75, and -375.
Define common differenceIn a arithmetic sequence, the common difference is the fixed value that is added to (or subtracted from) each term to get the next term in the sequence.
To find the first four terms of the sequence given by aₙ= 3(-5)ⁿ⁻¹, we simply substitute n = 1, 2, 3, and 4, respectively, into the formula for an and evaluate:
a₁= 3(-5)¹⁻¹ = 3(-5)⁰= 3(1) = 3
a₂ = 3(-5)²⁻¹ = 3(-5)¹= -15
a₃ = 3(-5)³⁻¹ = 3(-5)²= 75
a₄= 3(-5)⁴⁻¹ = 3(-5)³= -375
Therefore, the first four terms of the sequence are 3, -15, 75, and -375.
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what is the constant of proportionality in the table below
Answer: 3
Step-by-step explanation:
k = y/x
find a basis for the subspace of consisting of all vectors such that . hint: notice that this single equation counts as a system of linear equations; find and describe the solutions. answer:
A basis for the subspace of all vectors satisfying the equation x + y + z = 0 is {(-1, 0, 1), (0, 1, -1)}.
SOLUTION:
A basis for the subspace of all vectors (x, y, z) satisfying the single equation x + y + z = 0 can be found by solving this system of linear equations.
Step 1: Choose two variables to express in terms of the remaining variable.
Let's express x and y in terms of z. From the given equation, we get:
x = -y - z
y = -x - z
Step 2: Choose two independent vectors that satisfy the equations.
We can choose two independent vectors by setting z = 1 and z = -1:
When z = 1:
x = -y - 1
y = -x - 1
Let y = 0, then x = -1, so one vector is (-1, 0, 1).
When z = -1:
x = -y + 1
y = -x + 1
Let x = 0, then y = 1, so the other vector is (0, 1, -1).
Therefore, a basis for the subspace of all vectors satisfying the equation x + y + z = 0 is {(-1, 0, 1), (0, 1, -1)}.
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factored form
What form is this equation written in?
y = -x² + 6x + 7
standard form
slope-intercept
form
vertex form
P
Answer: Should be standard form.
Step-by-step explanation: Just cause the others don't really make sense and the equation looks basic.
NATIONAL DEBT In 1915, the U.S. National Debt was approximately 3.1 × 10⁹ dollars. In 2015, the U.S. National Debt was approximately 5.9 × 10³ times more than in 1915. What was the U.S. National Debt in 2015?
Answer:
18.29 x 10^12
Step-by-step explanation:
you can simplify the answer as needed