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Minchanka [31]
3 years ago
10

30 Points!!

Mathematics
1 answer:
neonofarm [45]3 years ago
4 0

Answer:

  multiply the left side of the constant vector by the inverse matrix

Step-by-step explanation:

The matrix equation ...

  AX = B

is solved by left-multiplying by the inverse of A:

  A⁻¹AX = A⁻¹B

  IX = A⁻¹B . . . . . the result of multiplying A⁻¹A is the identity matrix

  X = A⁻¹B . . . . . B needs to be multiplied by the inverse matrix

\left[\begin{array}{c}x&y\end{array}\right] = \left[\begin{array}{cc}-4&1\\3&2\end{array}\right]^{-1}\left[\begin{array}{c}9&7\end{array}\right]=\dfrac{1}{11}\left[\begin{array}{cc}-2&1\\3&4\end{array}\right]\left[\begin{array}{c}9&7\end{array}\right]=\left[\begin{array}{c}-1&5\end{array}\right]

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3 years ago
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5 0
2 years ago
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Which numbers are necessary to solve this problem?
SSSSS [86.1K]

Answer:

A

Step-by-step explanation:

A: 3 times a week, 45 minutes, 15 minutes, 4 weeks

In the beginning of the word problem it says Brian goes to the gym 3 times a week. We need to know that because you have to use that number later for multiplication.

The 45 minutes are important because he spends 45 minutes at the gym each visit.

The 15 minutes are important because you have to subtract that from 45 because 15 of the 45 minutes are spent on weights, the rest of the time is spent on the treadmill, and we need to know how long Brian is on the treadmill in 4 weeks.

So the equation should be: [(45-15)* 3]*4

Solution step-by-step:

45-15= 30 minutes for treadmill

30*3=90 minutes per week

90*4= 360 minutes in 4 weeks

Convert into hours:

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Hope this helps!!! :D

3 0
3 years ago
when signing the lease for her new apartment, tanya paid a security deposit that earned 4% simple annual interest. At the end of
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Hello Shelbyhall, simply you would multiply 17.50 * 25 because 4 * 25 = 100%. Answer: 437.5 is the other 96% :)
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3 years ago
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My name is Ann [436]

Answer:

step 1

Step-by-step explanation:

7 0
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