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Mathematics

1 answer:

Mrrafil [7]3 years ago

3 0

The answer for the spinner would be 1/2 because there are 4 R’s out of 8 so it would be 4/8 which simplifies to 1/2
The answer for the second one I’m sure would be .45 since rolling a one would add up to 9 and the total times it was rolled is 20 so if she rolls again she would have .45 since that’s the answer to 9/20

Hope this helps !

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CAN SOME ONE HELP PLZZZZZZZ IF YOU DONT KNOW THO PLZZ DONT ANSWER IM ONLY CHOIS BRAINLEST IF YOU SAY WHY YOU CHOSE THAT ANSWER T

Ivan

Answer:

i think the answer is c

Step-by-step explanation:

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4 0

3 years ago

The reciprocal of two more than a number is three times the reciprocal of the number. find the number

vichka [17]

Let the number be x
reciprocal=1/x
2 more the reciprocal=1/2+x
but 1/2+x=3(1/x)
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4 0

3 years ago

A = ???? 4 −2

irinina [24]

Answer:

1. The matrix A isn't the inverse of matrix B.

2. |B|=12, |A|=12

Step-by-step explanation:

1. We want to know if matrix A is the inverse of matrix B, this means that if you do the product between B and A you have to obtain the identity matrix.

We have:

$A=\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]$

and

$B=\left[\begin{array}{cc}3&2\\1&4\end{array}\right]$

A and B are 2×2 matrices (2 rows and 2 columns), if you multiply them you have to obtain a 2×2 matrix.

Then if A is the inverse of B:

$B.A=I$

Where,

$I=\left[\begin{array}{cc}1&0\\0&1\end{array}\right]$

Observation:

If you have two matrices:

$A=\left[\begin{array}{cc}a&b\\c&d\end{array}\right]\\and\\B=\left[\begin{array}{cc}e&f\\g&h\end{array}\right]\\\\\\A.B=\left[\begin{array}{cc}(a.e+b.g)&(a.f+b.h)\\(c.e+d.g)&(c.f+d.h)\end{array}\right]$

Now:

$B.A=\left[\begin{array}{cc}3&2\\1&4\end{array}\right].\left[\begin{array}{cc}4&-2\\-1&3\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}4.3+(-2).1&4.2+(-2).4\\(-1).3+3.1&(-1).2+3.4\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}12-2&8-8\\-3+3&-2+12\end{array}\right]\\\\\\B.A=\left[\begin{array}{cc}10&0\\0&10\end{array}\right]$