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eimsori [14]
3 years ago
6

The high school courtesy club bought red and black ink pens for Teacher Appreciation Day. The club bought 75 pens in all. Each b

lack pen cost $1.75, and each red pen cost $2.00. The club spent $137 altogether for the pens. How many black pens did the club buy?
13
23
48
52
Mathematics
1 answer:
dezoksy [38]3 years ago
8 0

Answer:

52

Step-by-step explanation:


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The half-life of iron-52 is approximately 8.3 hours.How much of a 13 gram sample of iron-52 would remain after 8 hours? Round to
Alexandra [31]

6.665 grams of the 13 grams remain after 8 hours.

<h3>How much of a 13 gram sample of iron-52 would remain after 8 hours?</h3>

The decay equation for the 13 grams of iron-52 is:

N(t) = 13g*e^{(-ln(2)/8.3h)*t}}

Where N is the amount of iron-52, and t is the time in years.

Where we used the fact that the half-life is exactly 8.3 hours.

Now, the amount that is left is given by N(8h), so we just need to replace the variable t by by 8 hours, so we get:

N(8h) = 13g*e^{(-ln(2)/8.3h)*8h}} = 6.665g

So 6.665 grams of the 13 grams remain after 8 hours.

If you want to learn more about half-life:

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5 0
2 years ago
What is 85% of 17,000 dollars that is asked on your irs tax forms
elena55 [62]
Hello!

17,000 * 85% = 14,450

85% of $17,000 is $14,450. 
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3 years ago
La proporción de empleados de una empresa que usan su auto para ir al trabajo es 5:16. Si hay un total de 800 empleados, diga la
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Answer:

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Step-by-step explanation:

Tenemos la siguiente información de la pregunta;

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8 0
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Vector vector a has a magnitude of 28 units and points in the positive y-direction. When vector vector b is added to vector a ,
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3 years ago
Train X traveled 216.6 kilometers in 38 minutes. How many miles per hour was it traveling?
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210 miles in 1 hour

Step-by-step explanation:

steps are in picture

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3 years ago
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