3 years ago

6x-4y=14 2x+8y=21 Solve by elimination

Mathematics

1 answer:

Viktor [21]3 years ago

8 0

I wrote some notes please read and if you not sure contact me

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Which property would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5? additive identity additive inv

Fofino [41]

Answer:

Commutative Property

Step-by-step explanation:

Additive Identity: If you add a real number to zero or add zero to a real number, then you get the same real number back.

Additive Inverse: When you add the same number but reversed sign, you get 0.

Commutative Property: a + b = b + a

Addition distributive property: a(b+ c) = ab + ac.

In this case, we use the commutative property:

27 + 15 + 3 + 5 = 27 + 3 + 15 + 5.

We know that 27 + 3 = 30 and 15 + 5 = 20, so we get 50 quickly using mental math.

5 0

3 years ago

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Los 2/7 de los vecinos de la casa de ángel son extremeños y ka cuarta parte de estos son Cáceres sabiendo que hay seis vecinos d

Anna [14]

Same lol I need English

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3 years ago

Find the difference of 1-3/8

Vilka [71]

1-3=-2 so -2/8 is -1/4 so negative one fourth

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3 years ago

If f(x)=ln(sin(2x)), f''(π/4) is equal to

Licemer1 [7]

Use the chain rule to compute the second derivative:

$f(x)=\ln(\sin(2x))$

The first derivative is

$f'(x)=(\ln(\sin(2x)))'=\dfrac{(\sin(2x))'}{\sin(2x)}=\dfrac{\cos(2x)(2x)'}{\sin(2x)}=\dfrac{2\cos(2x)}{\sin(2x)}$

$f'(x)=2\cot(2x)$

Then the second derivative is

$f''(x)=(2\cot(2x))'=-2\csc^2(2x)(2x)'$

$f''(x)=-4\csc^2(2x)$

Then plug in π/4 for <em>x</em> :

$f''\left(\dfrac\pi4\right)=-4\csc^2\left(\dfrac{2\pi}4\right)=-4$

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3 years ago

Help please... Math hw

Montano1993 [528]

F: $30.05

172.90-52.71=120.19
120.19/4= 30.048 rounds to $30.05

Hope this helps!

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3 years ago