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Zina [86]
2 years ago
13

Use the fact that the quantity of a radioactive substance after t years is given by

Mathematics
1 answer:
AURORKA [14]2 years ago
6 0

Answer:

  50 kg

Step-by-step explanation:

Put the given numbers into the given formula and do the arithmetic.

  q = q0(2^(-t/k))

  q = (87 kg)(2^(-20/25)) = (87 kg)(0.574349)

  q ≈ 50 kg

The amount remaining after 20 years is about 50 kg.

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Find the missing dimension of the cylinder. round your answer to the nearest whole number
Ulleksa [173]

Answer:

11 meters

Step-by-step explanation:

Use the formula:

V = \pi r^{2} h

V = 7599, h = 20, π = 3.14

Plugin the numbers and solve for r

7599=3.14(20)r^{2} \\7599=62.8r^{2} \\7599/62.5=62.8r^{2} /62.8\\121=r^{2} \\\sqrt{121}=\sqrt{r^{2} } \\r=11

8 0
2 years ago
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rewona [7]
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8 0
3 years ago
Data may be classified by one of the four levels of measurement. What is the name of the lowest level?
coldgirl [10]

Answer:

Nominal

Step-by-step explanation:

There are four levels of measurement of data listed below in increasing order:

Nominal

Ordinal

Interval

Ratio

The nominal level of measurement is the lowest level that deals with names, categories and labels. It is a qualitative expression of data e.g Colors of eyes, yes or no responses to a survey, and favorite breakfast cereal all deal with the nominal level of measurement.

Data at this level can't be ordered in a meaningful way, and it makes no sense to calculate things such as means and standard deviations.

5 0
3 years ago
BRAINLIEST QUESTION
Debora [2.8K]

Answer:

the answer is triangles ABC and DEC are similar

Step-by-step explanation:

angle C is a common angle for both triangles

angle D is equal to angle A ( corresponding angles)since they are parallel

angle B is also equal to angle B for the same reason as angle D and A

since the three angles of the two angles are equal they are similar

6 0
3 years ago
I need help with this math problem
Anika [276]

She did 12 questions, and needs to do 36.


36 / 12 = 3, so it will take 3 times as long.

1 hour 20 minutes times 3 = 4 hours.


It will take her 4 hours.

5 0
3 years ago
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