2 years ago

Which of the following is not a characteristic of both experiments and

2 answers:

8 0

The researcher exercise direct control over at least one variable.

8 0

Answer:

C?correct me if I'm wrong

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Iteru [2.4K]

Answer:

Step-by-step explanation:

The perfect square:

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We have

$y^2+14y+49=0\\\\y^2+2(y)(7)+7^2=0\\\\(y+7)^2=0\iff y+7=0\qquad\text{subtract 7 from both sides}\\\\\boxed{y=-7}$

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$y^2+16y+64=0\\\\y^2+2(y)(8)+8^2=0\\\\(y+8)^2=0\iff y+8=0\qquad\text{subtract 8 from both sides}\\\\\boxed{y=-8}$

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Reika [66]

Answer:

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Step-by-step explanation:

you can - or + the equation only then when the letter is same z and z both are same so you can - them and get the answer.

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1 year ago