1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Paul [167]
3 years ago
10

A student solve this problem and said the answer is 9 pounds.

Mathematics
2 answers:
lukranit [14]3 years ago
7 0
Ethan bought 9.9 pounds of meat (2.2+3.6+4.1) I would say this is reasonable.
kondaur [170]3 years ago
7 0
The student is wrong because if you do 
2(1/5) + 3(3/5) + 4(1/10) it all equals up to 2.6
You might be interested in
Solve for XX. Assume XX is a 2×22×2 matrix and II denotes the 2×22×2 identity matrix. Do not use decimal numbers in your answer.
sveticcg [70]

The question is incomplete. The complete question is as follows:

Solve for X. Assume X is a 2x2 matrix and I denotes the 2x2 identity matrix. Do not use decimal numbers in your answer. If there are fractions, leave them unevaluated.

\left[\begin{array}{cc}2&8\\-6&-9\end{array}\right]· X·\left[\begin{array}{ccc}9&-3\\7&-6\end{array}\right] =<em>I</em>.

First, we have to identify the matrix <em>I. </em>As it was said, the matrix is the identiy matrix, which means

<em>I</em> = \left[\begin{array}{ccc}1&0\\0&1\end{array}\right]

So, \left[\begin{array}{cc}2&8\\-6&-9\end{array}\right]· X·\left[\begin{array}{ccc}9&-3\\7&-6\end{array}\right] =  \left[\begin{array}{ccc}1&0\\0&1\end{array}\right]

Isolating the X, we have

X·\left[\begin{array}{ccc}9&-3\\7&-6\end{array}\right]= \left[\begin{array}{cc}2&8\\-6&-9\end{array}\right] -  \left[\begin{array}{ccc}1&0\\0&1\end{array}\right]

Resolving:

X·\left[\begin{array}{ccc}9&-3\\7&-6\end{array}\right]= \left[\begin{array}{ccc}2-1&8-0\\-6-0&-9-1\end{array}\right]

X·\left[\begin{array}{ccc}9&-3\\7&-6\end{array}\right]=\left[\begin{array}{ccc}1&8\\-6&-10\end{array}\right]

Now, we have a problem similar to A.X=B. To solve it and because we don't divide matrices, we do X=A⁻¹·B. In this case,

X=\left[\begin{array}{ccc}9&-3\\7&-6\end{array}\right]⁻¹·\left[\begin{array}{ccc}1&8\\-6&-10\end{array}\right]

Now, a matrix with index -1 is called Inverse Matrix and is calculated as: A . A⁻¹ = I.

So,

\left[\begin{array}{ccc}9&-3\\7&-6\end{array}\right]·\left[\begin{array}{ccc}a&b\\c&d\end{array}\right]=\left[\begin{array}{ccc}1&0\\0&1\end{array}\right]

9a - 3b = 1

7a - 6b = 0

9c - 3d = 0

7c - 6d = 1

Resolving these equations, we have a=\frac{2}{11}; b=\frac{7}{33}; c=\frac{-1}{11} and d=\frac{-3}{11}. Substituting:

X= \left[\begin{array}{ccc}\frac{2}{11} &\frac{-1}{11} \\\frac{7}{33}&\frac{-3}{11}  \end{array}\right]·\left[\begin{array}{ccc}1&8\\-6&-10\end{array}\right]

Multiplying the matrices, we have

X=\left[\begin{array}{ccc}\frac{8}{11} &\frac{26}{11} \\\frac{39}{11}&\frac{198}{11}  \end{array}\right]

6 0
3 years ago
Jane takes her cat to the veterinarian. The veterinarian charges a $45 initial charge for the visit plus $22.50 per vaccine. Whi
uranmaximum [27]
The answer is D

Explanation:22.5 is how much each vaccine is and x is how many vaccines while y is the total cost and 45 is a standard fee
8 0
3 years ago
Read 2 more answers
Which angles are corresponding angles?
Mrac [35]
The answer would be angles UVX and RSQ.
Hope this helps
6 0
3 years ago
How do we write the difference of a number and 4?
rjkz [21]

Answer:

x-4

Step-by-step explanation:

easy

8 0
3 years ago
Read 2 more answers
Solve the equation -4x+12=-4 for x .
mihalych1998 [28]
-4x +12 -12 = -4 -12
-4x = -16
x = 4
4 0
3 years ago
Read 2 more answers
Other questions:
  • The average daily sales at a bookstore was(7.6k + 2.2) dollars over a 4-day promotion.Find the total sales during the promotion.
    10·1 answer
  • At Yogurt Express they charge $0.17 per ounce for yogurt and toppings. Maria pays $2.04 for her yogurt. How many ounces of yogur
    15·1 answer
  • How would I answer c and d?
    15·1 answer
  • X:y= 5:3 and x+y =56 workout the value of x-y
    7·1 answer
  • Please help ill mark brainliest
    13·2 answers
  • Solve x3 = 64 over 27
    5·2 answers
  • PLS HELP ME ASAP
    8·1 answer
  • Alissa was reminded people about rehearsal. Alissa remided 2 people and these 2 people reminded 3 people and these 3 people remi
    13·2 answers
  • if I eat 230 gumballs and there was a total of 1696 and my friend takes the rest of the 1760 gumballs. how did we get 1760 if th
    13·2 answers
  • Help please!!!<br> (please show work)
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!