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mariarad [96]
3 years ago
12

Which expression is equivalent to 7/2x -3(5x -1/2)

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

Answer:

I think the answer is B, that was what i got

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Use a matrix equation to solve the system of linear equations. left brace Start 2 By 1 Matrix 1st Row 1st Column 2nd Row 1st Col
natali 33 [55]

Answer:

\left[\begin{array}{ccc}3&-1&\\-1&1/2\\\end{array}\right]

Step-by-step explanation:

The matrix system for the linear equations: x + 2y = 8, 2x + 6y = 9

\left[\begin{array}{ccc}1&2&\\2&6\\\end{array}\right] \left[\begin{array}{ccc}x\\y\end{array}\right] = \left[\begin{array}{ccc}8\\9\end{array}\right]

To get the coefficient of x and y, the inverse of the first matrix (let the first matrix be A) must be known.

A^{-1} = (1 / determinant of A) x Adjoint of A

the determinant of A = (1 x 6) - (2 x 2) = 6 - 4 = 2

Adjoint of A = \left[\begin{array}{ccc}6&-2&\\-2&1\\\end{array}\right]

A^{-1}= \frac{1}{2} \left[\begin{array}{ccc}6&-2\\-2&1\end{array}\right] = \left[\begin{array}{ccc}3&-1&\\-1&1/2\\\end{array}\right]

4 0
3 years ago
Can somebody please solve question 11 for me?
love history [14]
1+tan^2(A) = sec^2(A) [Pythagorean Identities]

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*see photo for complete solution*

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3 years ago
HELP FAST PLEASE <br> Twenty is what percent of 200<br> 10%<br> 80%<br> 20%<br> 40%
mrs_skeptik [129]
10%

200 x x%=20
x=10%

Do u understand ?
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3 years ago
Dylan is making a casserole that serves 4 people. The recipe calls shredded cheese in grams kilograms? Explain
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Hope this helps ! :)

8 0
3 years ago
400,000 in expanded form
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4*1000 is the answer to the problem. plz give me a brainliest answer because i spent alot of work on that

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3 years ago
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