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olga_2 [115]
2 years ago
7

11 th grade algebra .

Mathematics
1 answer:
Ksju [112]2 years ago
7 0

Answer:

  C

Step-by-step explanation:

The inverse of a matrix is the transpose of the cofactor matrix, divided by the determinant. The determinant is (4)(3) -(1)(-5) = 17, eliminating choice B.

In a 2×2 matrix, the transpose of the cofactor matrix swaps the diagonal elements, and negates the off-diagonal elements. That is, the transpose of the cofactor matrix will look like the matrix of B. When that is divided by 17, you get the matrix of answer choice C.

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Select the correct answer
Rama09 [41]

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Step-by-step explanation:

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In parallelogram abcd, ab=14, bc=20, m(angle)b=54. Find to the nearest tenth the length of diagonal bd, and find measure angle d
muminat
It is is a parallelogram, hence we have to face sides equal in length and the opposite angles are also the same. From the given above we have:
ab=14 and its opposite side cd=14
bc=20 and its opposite side da=20

Solving for the diagonal measurement bd, we have consecutive angles are equal to 180°
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Solving for the angle dbc, we have
cos dbc=bc²+bd²-cd²/a*bc*bd
cos dbc=20²+30.42²-14²/2*20*30.42
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3 0
3 years ago
If you go out to eat, a good tip is $18 when the bill costs $100. What is this percent?
dlinn [17]

Answer:

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Step-by-step explanation:

On average the proper tip is 15% of the cost of your meal cost. In this case you have paid 18% of your meal cost.

4 0
3 years ago
Read 2 more answers
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Answer:

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Step-by-step explanation:

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1/3 = 0.33333333333

So, its 5.333

7 0
3 years ago
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