3 years ago

Please help

Mathematics

2 answers:

babymother [125]3 years ago

5 0

It is a valid sample because the first eight people were selected to participate? (the first one)

Vsevolod [243]3 years ago

5 0

Answer:

the answer is b

Step-by-step explanation:

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how many gallons of a 80% antifreeze solution must be mixed with 70 gallons of 30% antifreeze to get a mixture that is 70% antif

Fynjy0 [20]

Let x=gallons of 80% solution to be mixed
x+80=gallons go final 70% mixture
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80%*x+30%*80=70%*(x+80)
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x=320
gallons of 80% solution to be mixed=320

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4 years ago

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2 years ago

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PIT_PIT [208]

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Step-by-step explanation:

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3 years ago

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Viefleur [7K]

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3 years ago

Suppose that Y varies directly with X andY equals 12 when X equals -2 what is X when Y equals -6

VLD [36.1K]

Answer:

$x=1$

Step-by-step explanation:

A direct variation equation has the following format:

$y=kx$

Where k is a constant.

We know that y is 12 when x is -2. Thus, substitute:

$12=-2k$

Divide both sides by -2:

$k=-6$

So, our direct variation equations is:

$y=-6x$

To find what x is when y equals -6, substitute in -6 for y:

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Divide both sides by -6:

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So, our answer is 1 :)

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3 years ago