Answers
A non-zero matrix A with A² = 0 is A = [tex]\left[\begin{array}{cc}0&1\\0&0\end{array}\right][/tex].
We need to find a 2 x 2 non- zero matrix with A² = [tex]\left[\begin{array}{cc}0&0\\0&0\end{array}\right][/tex]
A² = A x A
If A = [tex]\left[\begin{array}{cc}a&b\\c&d\end{array}\right][/tex], then A x A = [tex]\left[\begin{array}{cc}a&b\\c&d\end{array}\right][/tex] x [tex]\left[\begin{array}{cc}a&b\\c&d\end{array}\right][/tex]
= [tex]\left[\begin{array}{cc}a^2+bc&ab+bd\\ac+dc&bc+d^2\end{array}\right][/tex]
This is called matrix multiplication.
Now consider the matrixes of the form A = [tex]\left[\begin{array}{cc}0&x\\0&0\end{array}\right][/tex]
Then A² = [tex]\left[\begin{array}{cc}0&x\\0&0\end{array}\right][/tex] x [tex]\left[\begin{array}{cc}0&x\\0&0\end{array}\right][/tex]
= [tex]\left[\begin{array}{cc}0&0\\0&0\end{array}\right][/tex]
Also Consider a matrix A = [tex]\left[\begin{array}{cc}0&0\\x&0\end{array}\right][/tex]
Then A² = [tex]\left[\begin{array}{cc}0&0\\x&0\end{array}\right][/tex] x [tex]\left[\begin{array}{cc}0&0\\x&0\end{array}\right][/tex]
= [tex]\left[\begin{array}{cc}0&0\\0&0\end{array}\right][/tex]
So any matrix of the form [tex]\left[\begin{array}{cc}0&x\\0&0\end{array}\right][/tex] and [tex]\left[\begin{array}{cc}0&0\\x&0\end{array}\right][/tex] with x any number, will give A² = 0
In particular, A = [tex]\left[\begin{array}{cc}0&1\\0&0\end{array}\right][/tex] is a non-zero matrix with A² = 0.
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Related Questions
1. Mark bought a pen for $0.49, a box of pencils for $1.29, and a pad of paper for $0.98. How much did he spend in all? 2 The coach honght 10 ice cream cones for $0 35 each How much did he spend?
Answers
If Mark bought a pen for $0.49, a box of pencils for $1.29, and a pad of paper for $0.98, then he had spend a total of $ 2.76, and if 10 ice cream cones were brought for $0.35 each, then the total amount paid is $3.5
As per the question statement, Mark bought a pen for $0.49, a box of pencils for $1.29, and a pad of paper for $0.98,
And the coach bought 10 ice cream cones for $0.35 each.
We are required to calculate the following:
(a) The total amount Mark had to pay
(b) The total amount the coach had to pay
Starting with part (a),
If Mark bought a pen for $0.49, a box of pencils for $1.29, and a pad of paper for $0.98, then the total amount he will have to pay will simply be the summation of the individual costs, that is, $[0.49 + 1.29 + 0.98] = $ 2.76.
Now solving part (b),
If the coach bought 10 ice cream cones for $0.35 each, then the total amount he/she will have to pay, will be a simple multiplication of the price of one ice cream, with the number of ice creams bought, that is,
$[0.35 * 10] =$3.5
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P is a polynomial defined by P(x) = 4x³ - 11x² - 6x + 9. Two factors are (x - 3) and
(x + 1). Rewrite the expression for P as the product of linear factors. Here is a blank
diagram to use to organize your thinking, if needed.
Answers
linear equations are defined as y=mx+b so we know the 2 given factors are linear, and our leftover (4x-3) is linear as well. Meaning we can no longer factor out anything further and the final answer is P(x)=(x-3)(x+1)(4x-3) but depending on how your teacher wants the answer you could write it P(x)=(x-3)(x+1)(x-3/4)
some people advise that in every cold weather, you should keep the gas tank in your car more than half full. Lou's car had 5.7 gallons in the 14 gallon tank on the coldest day of the year. Lou filled the tank with gas that cost $3.60 per gallon. How much did Lou spend on gas?
Answers
The amount that Lou spent in gas is $20.52.
What is the cost?Lou's car had 5.7 gallons in the 14 gallon tank on the coldest day of the year and he filled the tank with gas that cost $3.60 per gallon.
The cost for the amount spent in gas will be:
= Gallons filled × Cost per gallon
= 5.7 × $3.60
= $20.52
The amount is $20.52.
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Ann Marie has a gross annual income of $98,000. According to Housing Recommendation #1, how much can she devote to monthly housing expenses?
Answers
Find a degree 3 polynomial with real coefficients having zeros 3 and 4 − 3 i and a lead coefficient of 1. Write P in expanded form.
Answers
[tex]x^{3}[/tex]-2[tex]x^{2}[/tex]+9x-18 This is a degree 3 polynomial with real coefficients having zeros 3 and 4 − 3 i and a lead coefficient of 1
What is polynomial ?Algebraic expressions called polynomials include constants and indeterminates. Polynomials can be thought of as a type of mathematics. Nearly all branches of mathematics employ them to express numbers, and calculus is one of those branches where they play a crucial role.
complex zeros always occur in pairs.
zeros are 2,3i,-3i
f(x)=(x-2)(x-3i)(x+3i)=(x-2)([tex]x^{2}[/tex]-[tex]3i^{2}[/tex])
=(x-2)([tex]x^{2}[/tex]-[tex]9i^{2}[/tex])
=(x-2)([tex]x^{2}[/tex]+9)
=[tex]x^{3}[/tex]-2[tex]x^{2}[/tex]+9x-18
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If I am given a line with the points (1,2) and (-1,-1) how would I find out what the slope-intercept form is?
Answers
Solution:
The slope-intercept form of a line with slope m and y-intercept b is given by the following formula:
[tex]y\text{ = mx+b}[/tex]On the other hand, the slope m is given by the following equation:
[tex]m\text{ = }\frac{Y2-Y1}{X2-X1}[/tex]where (X1,Y1) and (X2,Y2) are points on the line. In this case, we can take the points:
(X1,Y1) = (1,2)
(X2,Y2) = (-1,-1)
replacing this data into the slope equation, we get:
[tex]m\text{ = }\frac{-1-2}{-1-1}\text{ = }\frac{-3}{-2}\text{ = }\frac{3}{2}[/tex]thus, the slope of the line would be:
[tex]m\text{ = }\frac{3}{2}[/tex]now, replacing this into the slope-intercept form of the line we get:
EQUATION 1
[tex]y\text{ = }\frac{3}{2}x\text{ + b}[/tex]We only need to find the y-intercept b. For that, take any point on the line, for example (x,y) = (1,2), and replace it into the previous equation:
[tex]2\text{ = }\frac{3}{2}(1)\text{ + b}[/tex]this is equivalent to:
[tex]2\text{ = }\frac{3}{2}+\text{ b}[/tex]solving for b, we get:
[tex]b\text{ = 2- }\frac{3}{2}\text{ = }\frac{1}{2}[/tex]that is:
[tex]b\text{ = }\frac{1}{2}[/tex]finally, replacing this into the EQUATION 1, we get:
[tex]y\text{ = }\frac{3}{2}x\text{ + }\frac{1}{2}[/tex]then, the slope-intercept form of a line with the points (1,2) and (-1,-1) would be:
[tex]y\text{ = }\frac{3}{2}x\text{ + }\frac{1}{2}[/tex]
What is 3/8 of 4/5??
Answers
[tex]\huge\text{Hey there!}[/tex]
[tex]\mathsf{\dfrac{3}{8}\ of\ \dfrac{4}{5}}[/tex]
[tex]\mathsf{= \dfrac{3}{8}\times \dfrac{4}{5}}[/tex]
[tex]\mathsf{= \dfrac{3\times4}{8\times5}}[/tex]
[tex]\mathsf{= \dfrac{12}{40}}[/tex]
[tex]\mathsf{= \dfrac{12\div4}{40\div4}}[/tex]
[tex]\mathsf{= \dfrac{3}{10}}[/tex]
[tex]\huge\text{Therefore, your answer should be: \boxed{\mathsf{\dfrac{3}{10}}}}\huge\checkmark[/tex]
[tex]\huge\text{Good luck on your assignment \& enjoy your day!}[/tex]
the table below shows the rebeltonshir betweenth number of miles travledet, and the number of salle
Answers
The question is really asking for the unit rate but on a supposedly linear graph that is not to scale, so it is difficult to evaluate real rates.
14% of what number is 21
Answers
Answer:
150 is the number
Step-by-step explanation:
The equation we should set up is from the sentence "14% of what number is 21"
To rearrange it into a proper equation, replace "of what number" with " * x "
and "is" with "="
The sentence becomes:
14% * x = 21
since 14% = 0.14, replace 14% with 0.14 in the equation
0.14 * x = 21
divide both sides by 0.14
x = 21 / 0.14
x = 150
The sentence become
14% * x = 21
Since 14% = 0.14,replace 14% with 0.14 in equation
0.14 * x = 21
Divide both sides by 0.14
X= 21/ 0.14
x = 150
3. What is the simple interest and the amount in the account if you invested$175.00 for 90 days at 8%?
Answers
The formula for the simple interest I after an amount P is invested for period t at a simple interest rate r is:
[tex]I=P\cdot r\cdot t[/tex]In this problem, the simple interest annual rate is 8% = 0.08. But the period t of the investment is
t = 90 days = 3 months = (12/4) months = (1/4) year
And the rate is:
[tex]r=\frac{0.08}{\text{year}}=\frac{\frac{0.08}{4}}{\frac{\text{year}}{4}}=\frac{0.02}{t}[/tex]Then, using P = 175, the interest, in dollars, is:
[tex]I=175\cdot\frac{0.02}{t}\cdot t=175\cdot0.02=3.5[/tex]And the amount A, in dollars, in the account after that period is:
[tex]A=P+I=175+3.5=178.5[/tex]Answers:
Simple interest: $3.50
Ammount: $178.50
(3y+11) ° = _____ °
10y ° = ______ °
(4x-22) ° = _____ °
(7x+4) ° = _____ °
Answers
Answer:
(3y + 11)° = 50°
10y° = 130°
(4x - 22)° = 50°
(7x + 4)° = 130°
Explanation:
First, find the value of the variable. Let's find y.
(3y + 11) + 10y = 180 (sum of adjacent angles on a straight line)
Simplify and solve the equation.
13y + 11 = 180
13y = 169
y = 13
Substitute y into the angle measures to find values.
3(13) + 11 = 50
10(13) = 130
Hence, (3y + 11)° = 50° and 10y° = 130°.
Next, find x.
(7x + 4) + (4x - 22) = 180 (sum of adjacent angles on a straight line)
Simplify and solve the equation.
11x - 18 = 180
11x = 198
x = 18
Substitute x into the angle measures to find values.
4(18) - 22 = 50
7(18) + 4 = 130
Hence, (4x - 22)° = 50° and (7x + 4)° = 130°.
Alternatively, you do not have to find x to find (4x - 22)° and (7x + 4)°.
4x - 22 = 3y + 11 = 50° (vertically opposite angles)
7x + 4 = 10y = 130° (vertically opposite angles)
Can somebody please help me right now??? i’m stuck and i need help with this bad
Answers
Answer:
B
Step-by-step explanation:
Using a minor key within a song is usually to make it more sad or negative in emotion, though with this question the fast tempo should already rule out A because it is quite the opposite to laziness.
In a box there a total of four prizes: Two of them are worth $3, a single prize worth $23, and a single prize worth $190. A player will reach into the box and draw one of the prizes at random. What is the fair price for this game?
Answers
Answer:
The fair price of the game is $54.75
The player is expected to win $54.75
Explanation:
Here, we want to get the fair prize of the game
From the question, there are 4 prizes
When reaching into the box, we can only pick 1
Assuming that each of the prizes have the same probability oof being picked, the probability of picking any of the prize is 1/4
Now, to get the fair price of the game (it is obviously positive as we do not know if the player has anything to lose)
We have to multiply the probability by each of the price tag, then sum
Mathematically,we have this as:
[tex]\begin{gathered} (2\times\frac{1}{4}\times\text{ \$3) + (}\frac{1}{4}\times\text{ \$23) + (}\frac{1}{4}\times\text{ \$190)} \\ \\ =\text{ \$1.5 + \$5.75 + \$47. 5 = \$54.75} \end{gathered}[/tex]Which of the following graphs shows a system of equations with the same end behavior for both functions? Thanks!
Answers
Solution
The answer is given in the graph below
Which multiplication expression can you use to find
3/4 divided by 3/8
Answers
The given multiplication expression is 3/4÷3/8 or 3/4×8/3
What is multiplication expression?
Mathematical expressions that include multiplication are called multiplication expressions. We combine the integers and then the like variables to simplify the equation. We will therefore obtain x to the second power if we multiply two xs together.
An answer to a multiplication sentence is obtained by multiplying the various components. The multiplier (first number), multiplicand (second number), and product are the components of a multiplication phrase (third number).
The simplest form of an expression is one in which terms cannot be concatenated. In order to write 3 + (2 5) simply: Start by carrying out the procedure between parenthesis. The addition should then be done.
Given, 3/4÷3/8
3/4×8/3
=2
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Please help!!If the simple interest on $7,000 for 4 years is $1,960, then what is the interest rate?
Answers
Use the formula for the simple interest
[tex]I=p\cdot r\cdot t[/tex]I= interest
p= initial deposit
r=rate
t= time
clear the equation for r
[tex]\frac{I}{p\cdot t}=r[/tex]replace data in the formula
[tex]\begin{gathered} \frac{1960}{7000\cdot4}=r \\ \frac{1960}{28000}=r \\ 0.07=r \end{gathered}[/tex]pass the decimal to percentage
7%
the interest rate is 7%
Which equations can be used to find the lengths of thelegs of the triangle? Select three options.0.5(x)(x + 2) = 24x(x + 2) = 24x2 + 2x - 24 = 0x2 + 2x - 48 = 0x2 + (x + 2)2 = 100
Answers
Triangle area is equal to
1/2 base x height x 0.5 base = x feet.Height = (x + 2) feet
= 24 square feet
24 = 0.5(x)(x+2) \s0.5(x)(x + 2) = 24
The formulas that can be used to determine the triangle's leg lengths must be equivalent to 0.5(x)(x + 2).
To elaborate on this: 0.5(x)(x + 2) = 24
0.5(x2+2x) = 24 b) x(x + 2) = 24 c) x2 + 2x - 24 = 0 0.5(x2+2x) = 24 x(x + 2) is not equal to 0.5(x2+2x)0.5(x)(x + 2) = 24 12(x)(x + 2) = 24 x2 + 2x = 2(24) x2 + 2x - 48 = 0 x2 + (x + 2) is not comparable to x2+2x- 24 = 0 or x2+2x- 48 = 0.² = 100 \sx² + x² + 4x + 4 = 1002x² + 4x = 962(x2 + 2x + 48)= 0 is equivalent to 0.5(x2 + 2x) = 24.
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Our rental car company turns $42 50% per day to run a car in 10 cents for every mile driven video want to run a car knowing next plans drive 225 miles and she has at the most $150 to spend
Answers
a rental car company charges $42.50 per day to rent a car intense sense for every mile driven Lydia wants to run a car knowing that she plans to drive 225 miles in she has at most $150 to spend
Let
x -------> the number of miles
y -----> the total charge
we have that
the linear equation that represent this problem is
y=0.10x+42.50
For x=225 miles
substitute teh value of x
y=0.10(225)+42.50
y=$65
An art store sells packages of two different-sized square picture frames. The side length of the larger frame, S(x), is modeled by the function S(a) = 3v2- - 1, where x is the area of the smaller frame in square inches. Which graph shows S(x)?
Answers
The graph A is the one that accurately represents the side length of the bigger frame S(x).
Modeling the function S(x) by
S(x) has experienced the following changes:
a 1 shift to the right, as shown by the square root's value of -1;
S(x) travels to the right by 1 = 0 + 1 = 1 whereas f(x) stays at 0.
The graph is stretched by a factor of 3 (a number that multiplied the square root).
Consequently, the graph A shows the two changes on S. (x). As a result, it is the best choice.
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4Use algebra to solve the following equation. Round decimal to two places.400 (1.065)t = 850
Answers
We need to solve the equation
[tex]400(1.065)t=850[/tex]In order to do so, we can first divide both sides of the equation by 400:
[tex]\begin{gathered} \frac{400}{400}(1.065)t=\frac{850}{400} \\ \\ (1.065)t=2.125 \end{gathered}[/tex]Now, to isolate the variable t on the left side and find its value, we can divide both sides by 1.065:
[tex]\begin{gathered} \frac{\mleft(1.065\mright)}{1.065}t=\frac{2.125}{1.065} \\ \\ t=1.9953\ldots \\ \\ t\cong2.00 \end{gathered}[/tex]Therefore, rounding to two decimal places, the answer is 2.00.
Find an anti derivative for each function when C = 0
Answers
Given:
[tex]\frac{9}{8}\sqrt[8]{x}[/tex]You can find the antiderivative by integrating it:
1. Set up:
[tex]\int\frac{9}{8}\sqrt[8]{x}\text{ }dx[/tex]2. You can rewrite it in this form:
[tex]=\frac{9}{8}\int x^{\frac{1}{8}}dx[/tex]3. Apply this Integration Rule:
[tex]\int x^ndx=\frac{x^{n+1}}{n+1}[/tex]Then, you get:
[tex]=\frac{9}{8}(\frac{x^{\frac{1}{8}+1}}{\frac{1}{8}+1})+C[/tex][tex]=\frac{9}{8}(\frac{x^{\frac{9}{8}}}{\frac{9}{8}})+C[/tex]4. Simplify:
[tex]=\frac{9}{8}(\frac{x^{\frac{1}{8}+1}}{\frac{1}{8}+1})+C[/tex][tex]=\frac{9}{8}(\frac{8\sqrt[8]{x^9}}{9})+C[/tex][tex]=\sqrt[8]{x^9}+C[/tex]Remember this Property for Radicals:
[tex]\sqrt[m]{b^n}=b^{\frac{n}{m}}[/tex]You can rewrite the expression in this form:
[tex]=\sqrt[8]{x\cdot x^8}+C[/tex]Applying this Property for Radicals:
[tex]\sqrt[n]{b^n}=b[/tex]You get:
[tex]=x\sqrt[8]{x}+C[/tex]5. Knowing that:
[tex]C=0[/tex]You obtain:
[tex]=x\sqrt[8]{x}[/tex]Hence, the answer is:
[tex]=x\sqrt[8]{x}[/tex]Richie Rich deposited $5,250 into an account. He made no additional deposits or withdrawals. Richie Rich earned 3.5% annual simple interest on the money in the account. What was the balance in dollars and cents in Richie Rich's account at the end of 5 years?
Answers
To calculate the balance on the account after 5 years you have to calculate the simple interest using the formula:
[tex]A=P(1-rt)[/tex]A= total accured amount
P= principal amount
r= interest rate expressed in decimals
t=time
For
P=$5250
r=0.035
t=5years
The balance on the account will be:
[tex]\begin{gathered} A=5250(1+0.035\cdot5) \\ A=6168.75 \end{gathered}[/tex]At the end of the 5 years there will be $6168.75
[tex]f(x)=x^{3}-3x^{2} -4x+12[/tex]
Answers
Answer:
the answer is f'(x)=3x^2-6x-4
Step-by-step explanation:
Graph the linear equation
y=4x-1
Answers
A line is uniquely defined by two points. So, we only need to find two points that lie on the line.
[tex]x=1 \implies y=4(1)-1=3\\\\x=2 \implies y=4(2)-1=7[/tex]
So, you can draw the line through (1, 3) and (2, 7).
two mechanics worked on a car the first mechanic worked for 10 hours in the second mechanic worked for 15 hours together they charged a total of $2,450 what was the rate charge per hour by each mechanic if the sum of the two rates was $185 per hour
Answers
wo mechanics worked on a car the first mechanic worked for 10 hours and the second mechanic worked for 15 hours together they charged a total of $2,450 what was the rate charge per hour by each mechanic if the sum of the two rates was $185 per hour
Let
x -----> the rate of the first mechanic
y -----> the rate of the second mechanic
we have that
x+y=185 -------> equation A
10x+15y=2,450 ------> equation B
Solve the system of equations by graphing
see the attached figure
therefore
the rate of the first mechanic is $65 per hour the rate of the second mechanic is $120 per hour11. In how many different ways can the letters of the word MATH be rearranged to form a four-letter code word (i.e. it doesn't have to be a word in English)?
Answers
The number of letters in the word MATH IS
[tex]=4[/tex]To rearrange a letter with n letters to form a four-letter code will be
[tex]\begin{gathered} n! \\ \text{Where n=4} \end{gathered}[/tex]Hence,
The number of ways of rearranging the words will be
[tex]\begin{gathered} =4! \\ =4\times3\times2\times1 \\ =24\text{ ways} \end{gathered}[/tex]This problem is a bit different. Instead of choosing one item from each of several different
categories, we are repeatedly choosing items from the same category (the category is: the
letters of the word MATH) and each time we choose an item we do not replace it, so there is
one fewer choice at the next stage: we have 4 choices for the first letter (say we choose A),
then 3 choices for the second (M, T, and H; say we choose H), then 2 choices for the next
letter (M and T; say we choose M) and only one choice at the last stage (T). Thus, there are
4 · 3 · 2 · 1 = 24 ways to spell a code word with the letters MATH.
Hence,
The final answer = 24 ways
cual es mayor, -4 o -3
Answers
Answer:
-3
Step-by-step explanation:
question is asking, which is larger. -3 is larger than -4
Help pls
A system of equations is shown below.
y=x²-11x - 36
y = - 12x + 36
What is the largest value of y in the solution set of the system?
Answers
Utilizing differentiation, the biggest value of y=0 in the system's solution set.
What is differentiation?One of the two fundamental concepts of calculus is differentiation. Differentiation is a method for finding a function's derivative. Differentiation is a mathematical technique used to calculate the instantaneous rate of change of a function based on one of its variables. Velocity, or how quickly a distance varies in respect to time, is the most common example. Differentiation's opposite is finding an antiderivative.
Differentiating the 1st equation, we get
x=5.5
Putting back in the equation.
y = -5.75
and differentiating the 2nd equation, we get
x=3
Putting back in the equation
y= 0
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PLEASE HELP HELP HELP HELP HELP
Answers
Answer:
WHAT IS THATT??
Step-by-step explanation:
OSKSKQKANSNSNSNSZKNSNSNSN
For every 20 minutes spent riding his bike, Tim stops 3 times to drink water. if he rides for 80 minutes how many times, he will stop to for a drink.
Answers
Answer:
Tim will stop for a drink 12 times
Step-by-step explanation:
Tim drinks water 3 times every twenty minutes. 80 divided by 20 equals 4. Take the 4 times and multiply it by 3 to get the amount of times he stopped to drink water.
I hope this helps