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Reil [10]
2 years ago
11

I just want ppl to check, extra points too!

Mathematics
1 answer:
Ann [662]2 years ago
7 0

Answer:

thats correct

Step-by-step explanation:

i had that on my test and i ot it right

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Dubnium-262 has a half-life of 34 s. How long will it take for 500.0 grams to
dmitriy555 [2]

Answer:

the time taken for the radioactive element to decay to 1 g is 304.8 s.

Step-by-step explanation:

Given;

half-life of the given Dubnium = 34 s

initial mass of the given Dubnium, m₀ = 500 grams

final mass of the element, mf = 1 g

The time taken for the radioactive element to decay to its final mass is calculated as follows;

1 = 500 (0.5)^{\frac{t}{34}} \\\\\frac{1}{500} =  (0.5)^{\frac{t}{34}}\\\\log(\frac{1}{500}) = log [(0.5)^{\frac{t}{34}}]\\\\log(\frac{1}{500})  = \frac{t}{34} log(0.5)\\\\-2.699 = \frac{t}{34} (-0.301)\\\\t = \frac{2.699 \times 34}{0.301} \\\\t = 304.8 \ s

Therefore, the time taken for the radioactive element to decay to 1 g is 304.8 s.

4 0
2 years ago
What is 30% off of 25??
Leto [7]

Answer:

7.5 = 8

Step-by-step explanation:

Step 1:

30/100=0.3

Step 2:

0.3 x 25 = 7.5

Round: 8

7 0
3 years ago
Read 2 more answers
1. (Sec. 6.1) In a random sample of 80 components of a certain type, 12 are found to be defective. (a) Give a point estimate for
denis-greek [22]

Answer:

(a) 0.85

(b) 0.7225

Step-by-step explanation:

(a) The point estimate for the proportion of all such components that are not defective is given by the number of non-defective units in the sample divided by the sample size:

p=\frac{80-12}{80}\\p=0.85

The proportion is 0.85.

(b) Assuming that the sample is large enough to accurately provide a point estimate for the whole population, this can be treated as a binomial model with probability of success (non-defective part) p = 0.85. Since both components must be non-defective for the system to work, the probability of two successes in two trials is:

P(x=2) = 0.85^2\\P(x=2) = 0.7225

An estimate of 0.7225 for the proportion of all such systems that will function properly.

4 0
2 years ago
(-3,0) and (0,2) standard form
Effectus [21]

Answer:

2x-3y=-6

Step-by-step explanation:

6 0
3 years ago
13. The length of a rectangular rug is 5 less than four times its width. The area of
MariettaO [177]

Answer:

1250

Step-by-step explanation:

i hope this helps

5 0
3 years ago
Read 2 more answers
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