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Lina20 [59]
3 years ago
6

Erik made an error in his homework. He said that

Mathematics
2 answers:
kap26 [50]3 years ago
8 0

Answer:

C

Step-by-step explanation:

Natasha2012 [34]3 years ago
7 0

Answer:

C) He should not combine 3x and 4x^2

Step-by-step explanation:

3x + 12 + 4x^2 - 3

You cannot combine 3x and 4x^2

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Solve the system of linear equations by substitution x-y=-4 2x+y=4
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Answer:

Given:

x-y=-4

2x+y=4

Step-by-step explanation:

x-y=-4

2x+y=4

add both the equation, we get

⇒  x-y=-4

  2x+y=4

⇒3x=-4+4

⇒3x=0

⇒x=0

∴ to find the value of y, put the value of x in any one equation

⇒x-y=-4

⇒0-y=-4

⇒-y=-4

⇒y=4

∴ x=0, y=4

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3 years ago
Niamh runs 6 km in 30-minutes what is the average speed in km h
SIZIF [17.4K]

Step-by-step explanation:

Speed = Distance / Time

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speed =

\frac{6}{\frac{1}{2} }  \\  = 6 \div  \frac{1}{2}  \\  = 6 \times 2 \\  = 12 \frac{km}{h}

4 0
3 years ago
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Please help will mark brainliest if correct
Annette [7]

Answer:

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Step-by-step explanation:

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