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alex41 [277]
3 years ago
7

Xavier performs the elementary row operation represented by Ri - R, on matrix A.​

Mathematics
1 answer:
yaroslaw [1]3 years ago
5 0

Answer:

4   3   0

7  9/2 -6

Step-by-step explanation:

Just took the test

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The product of a number and -3, increased by 8, is 20
natita [175]

answer:

-4

Step-by-step explanation:

-3x+8= 20

-8 -8

-3x = 12

÷-3. = ÷-3

x = -4

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3 years ago
Write using exponents. Work from left to right on the grid.<br><br> 6 • 6 • 6
makkiz [27]

The answer is 6^3


6*6*6= 216

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What is the probability of getting heads and a b, c, and d
sp2606 [1]
I mean probably of getting head is a half if that's what u mean but what is a,b,c,d
4 0
3 years ago
Need help fast due today thanks
cricket20 [7]

1

Move everything to the left by subtracting 25 from both sides:

81x^2-25=0

Both terms are squares: 81x^2 is the square of 9x, while 25 is the square of 5. So, we can apply the factoring

a^2-b^2=(a+b)(a-b)

To factor the expression as

(9x+5)(9x-5)=0

A multiplication is zero if and only if one of the factors is zero, so we have

(9x+5)(9x-5)=0 \iff 9x+5=0 \lor 9x-5=0 \iff x=-\dfrac{5}{9} \lor x=\dfrac{5}{9}

2

The discriminant of the quadratic expression ax^2+bx+c is defined as

\Delta = b^2-4ac

So, you have

\Delta = 0^2-4\cdot(-1)\cdot(-25) = -100

3

Similarly, we have

\Delta = 7^2-4\cdot(-3)\cdot 6 = 49+72=121

8 0
3 years ago
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