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guapka [62]
3 years ago
8

After 3 days a sample of radon-222 has decayed to 58% of its original amount.

Mathematics
1 answer:
Rina8888 [55]3 years ago
6 0
The half-life of the radioactive substance can be determined through teh equation ln 2 = k (t 1/2) where k is equal to ln (1/(1-0.58)) / 3. Hence t 1/2 is equal to 2.40 days. To decay to 10% of the original amount, ln (1/0.90) / ( ln2) / 2.40, time is equal to 0.37 days.
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(5 points)
Schach [20]

Answer:

The original Slope is y=-1/3x-2

The perpendicular slope would be y=3x+b

Step-by-step explanation:

Original Slope:

You already have the y-interecpet, (0,-2), and you know two points (0,-2) and (-6,0), so you can find the slope with (y1-y2)/(x1-x2) so in this case, it would be (0-(-2))/(-6-0)= -1/3 and you can find y=1/3x-2.

Perpendicular Slope:

The slope of any perpendicular line would be the reciprocal of the original. So the reciprocal of -1/3 is 3. The b can be any real number because no matter the y-intercept the slope would still be perpendicular

3 0
2 years ago
Write any<br>Five Places where ICT<br>tools can be used.​
alexandr1967 [171]

Answer:

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Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Find the total lateral area of the following
maxonik [38]

Answer:

15π cm²

Step-by-step explanation:

The total lateral area of a cone

= πr√h² + r²

= √h² + r² = l

h = Height = 4cm

r = radius = 3cm

Hence:

= π × 3 √4² + 3²

= 3π × √16 + 9

= 3π × √25

= 3π × 5

= 15π cm²

7 0
2 years ago
The graph shows the total numbet of inches of snow that fell in a town in February over ten year period. What is the approximate
elena-14-01-66 [18.8K]

Answer:

0.6

Step-by-step explanation:

7 0
2 years ago
it takes alice 4 5/6 hours to drive to her grandparents house for thanksgiving. On the way home, she ran into traffic it took he
horsena [70]

Answer:

1 3/24

Step-by-step explanation:

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2 years ago
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