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uranmaximum [27]
4 years ago
7

BRAINLIESTTTTTTT!

Mathematics
1 answer:
lawyer [7]4 years ago
5 0
1. Well, we know it cannot be either the last or second to last answer as the original amount of pollutant (when x=0) is 10 tons. 
After 1 foot of pipe 8 tons of pollutant are left (x=1). 8 tons is 80% of the original amount of the pollutant present. So, each foot of pipe keeps 80% of the pollutant. Make sense?

2. Just plug in the point into each answer choice.
(2,4)
y= 0.5x+ 5
4=0.5(2)+5
4=6
which is not true therefore the first answer choice is incorrect. 

y=0.5x -3
4=0.5(2)-3
4=1-3
4=2
which is not true therefore the first answer choice is incorrect. 

y=0.5x-5
4=0.5(2)-5
4=-4
which is not true therefore the first answer choice is incorrect. 

y=0.5x +3
4=0.5(2)+3
4=1+3
4=4
This is the correct answer.

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Answer:

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Step-by-step explanation:

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Need Help ASAP
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A parabola is given by the equation y2 = -24x. The equation of the directrix of the parabola is
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<span>Find the focus and directrix of the parabola with the given equation. Then graph the parabola. 
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This is an equation of a parabola with a horizontal axis of symmetry. 
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Vertex(0,0) 
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see the graph below as a visual check on the answers:
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Hope this helps!

Comment if you have questions!
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3 years ago
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