2 years ago

Find the solution of the system of equations. -3x – 2y = -6 7x + 6y = 26

Mathematics

1 answer:

allsm [11]2 years ago

7 0

Answer:

(-4,9)

Step-by-step explanation:

i hope this helps :)

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Element X decays radioactively with a half life of 12 minutes. If there are 690 grams of Element X, how long, to the nearest ten

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Step-by-step explanation:

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2 years ago

5x70= 5 x_____tens <br> = ______tens =______? <br> Use place value to find the product.

zhuklara [117]

5 × 70 = 5 × 7 tens = 350

WHY?

1 ten = 10 ones

70 ÷ 10 = 7

So 7 tens.

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2 years ago

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zhenek [66]

Answer:

Step-by-step explanation:

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2 years ago

Completing the square:

vichka [17]

Answer:

Step-by-step explanation:

Key to this method is remembering that

$(a+b)^2 = a^2 + 2ab + b^2$

So, if you divide the coefficient of x by 2 and square it, that will complete the square. With that in mind, things are easy.

6/2 = 3, so add $3^2 = 9$

$x^2+6x+9 = (x+3)^2$

So, c=9

Similarly, for the other two,

$c = (\frac{-34}{2} )^2 = (-17)^2 = 289$

You don't really have to worry about the sign, since squaring will always make it positive

$(\frac{25}{13}) ^2 = \frac{625}{169}$

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3 years ago

Help me Please I'm confused!!!!!!!

Andrew [12]

Answer:

5 x k = 15 + 3 = 18

Step-by-step explanation:

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2 years ago