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Oksana_A [137]
3 years ago
5

Heating oil is to be poured at the constant rate of 4.5 gallons per minute into a 400-gallon tank that already contains 115 gall

ons of heating oil. What fraction of the tank's total capacity will be full in 30 minutes?
Mathematics
1 answer:
kirill [66]3 years ago
3 0

Answer:

5/8

Step-by-step explanation:

The volume after 30 minutes is:

(4.5 gal/min) (30 min) + 115 gal = 250 gal

The fraction of total capacity is:

250 gal / 400 gal = 5/8

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2x^{3}+30xx^{2} +72x=0 solve using zero product property
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Answer:

Values of x are: x=0 or x=-3 or x=-12

Step-by-step explanation:

The equation given to solve using zero product property is 2x^3+30x^2+72x=0

Zero property rule states that if ab=0 then a=0 or b=0

Taking x common from the equation:

2x^3+30x^2+72x=0\\x(2x^2+30x+72)=0\\

Applying zero product rule

x(2x^2+30x+72)=0\\x=0 \ or \ 2x^2+30x+72=0

Now, solving 2x^2+30x+72=0

Using quadratic formula to find value of x

$x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

Putting values

$x=\frac{-30\pm\sqrt{(30)^2-4(2)(72)}}{2(2)}$\\$x=\frac{-30\pm\sqrt{324}}{4}$\\$x=\frac{-30\pm18}{4}$\\$x=\frac{-30+18}{4} \ or \ x=\frac{-30-18}{4}$  \\x=-3 \ or \ x=-12

So, Values of x are: x=0 or x=-3 or x=-12

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(4×⁴+3׳+2ײ-×+1)+(5ײ-2×+3)​
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Answer:

4×⁴+3׳+7ײ-3x+4

Step-by-step explanation:

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