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julia-pushkina [17]
2 years ago
11

I was planting a tree in my backyard and hit something hard. I dug it out and decided it was an ore of copper. I took its mass,

and it was 65.0 grams. after some tricky experiments in my basement lab, I managed to extract 11.5 grams of copper. what is the mass percent of copper in the ore I discovered? a.63.5%b.18.1%c.5.65%d.17.7%
Mathematics
1 answer:
daser333 [38]2 years ago
3 0

Answer:

option (d) 17.7%

Step-by-step explanation:

Data provided in the question:

Mass of the ore of copper extracted from the backyard = 65.0 grams

Mass of the copper extracted from the ore of copper = 11.5 grams

Now,

The mass percent of copper discovered

= [ ( Mass of the copper extracted ) ÷ ( Mass of the copper ore extracted ) ] × 100%

= [ 11.5 grams ÷ 65.0 grams ] × 100%

= 17.692% ≈ 17.7%

Hence,

the answer is option (d) 17.7%

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Answer:

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Step-by-step explanation:

Here given that a basketball player that shoots 80% from the free throw line attempts two free throws.

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When A and B are independent,then we have

P(A/B) = P(A)

Hence answer is

P(made 2nd attempt|made 1st attempt)=P(made 2nd attempt)


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