A) True

The domain of a quadratic function in standard form is always all real numbers, meaning you can substitute any real number for x. The range of a function is the set of all real values of y that you can get by plugging real numbers into x.

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2 years ago

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From a full 50-liter container of a 40% concentration of acid, x liters are removed and replaced with 100% acid. (A) Write the a

never [62]

Answer:

A) 20+0.6 $x$

B) range is [0, 50] (i.e. both inclusive)

C) 8.33 litres

Step-by-step explanation:

Given that concentration of acid in 50 litre container is 40%.

Amount of acid in the container = 40% of 50 litres

Amount of acid in the container = $\frac{40}{100} \times 50 = 20\ litre$

$x$ litres are removed.

Amount of acid removed = 40% of $x$ litre.

Now, remaining acid in the container = (20 - 40% of $x$ ) litre

Now, replaced with 100% acid.

So, final acid in the container = (20 - 40% of $x$ + 100% of $x$ ) litre

Amount of acid in the final mixture:

$20 - \dfrac{40}{100} \times x + \dfrac{100}{100} \times x\\\Rightarrow 20 +\dfrac{100-40}{100}x\\\Rightarrow 20 +\dfrac{60}{100}x$

Answer A) Amount of acid in the final mixture = 20+0.6 $x$

Answer B) $x$ can not be greater than 50 litres (initial volume of container) and can not be lesser than 0 litres.

so, range is [0, 50] (i.e. both inclusive)

Answer C)

Given that final mixture is 50% acid.

amount of acid = 50% of 50 litres = 25 litres

Using the equation:

$20+0.6x =25\\\Rightarrow 0.6x =5\\\Rightarrow \bold{x =8.33\ litres}$

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2 years ago