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Pie
2 years ago
5

A sample of copper (Cu) contains 69.17% Cu-63. The remaining copper atoms are Cu-65. What is the average atomic mass of copper?​

Mathematics
1 answer:
jeyben [28]2 years ago
5 0
The atomic mass is 63.55 amu
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Which graph represents the equation -5x+4y>-1?
galben [10]
<h3>Answer: Choice D</h3>

======================================================

Explanation:

The inequality sign has an "or equal to", which means the boundary line will be solid. We can rule out choices B and C because they have dashed boundary lines.

A solid boundary line means that points on the boundary are part of the solution set.

Now let's see what happens when we plug in a point like (x,y) = (4,0). This will tell us how to shade the blue region.

-5x + 4y \ge -1 \\\\-5(4) + 4(0) \ge -1 \\\\-20 \ge -1 \\\\

This is false because -20 is not larger than -1. It's the other way around.

This tells us the point (4,0) is not in the blue shaded region, and it's not on the boundary line either. We can rule out choice A because of this.

The only thing left is choice D, which is the final answer. I recommend plugging a point from this region into the inequality to confirm we have a true statement.

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3 years ago
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3 years ago
Doctor better than teacher debate<br>​
Jet001 [13]

Answer:

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Step-by-step explanation:

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2 years ago
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ivann1987 [24]

Answer:

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Step-by-step explanation:

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So f(-1)=-8.

So we have this so far:

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g(-8) was found by replacing x in x^2 with -8.

8 0
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