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3 years ago

Will give brainliest to right answer please help!! 15 points -A sample of a radioactive isotope had an initial mass of 370 mg

Mathematics

2 answers:

rewona [7]3 years ago

5 0

Answer: 28

Step-by-step explanation:

Alex777 [14]3 years ago

4 0

Answer:

78 mg

Step-by-step explanation:

370 mg - 110 mg = 260 mg (amount decayed in the 8 total years)

260 mg ÷ 8 years = 32.5 mg decayed per year

32.5 × 9 years (years between 2008 and 2017) = 292.5 mg

370 mg - 292.5 mg = 77.5 mg, rounded to 78 mg

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Please explain. Thanks.

pychu [463]

This is the simplest way I could explain that complex question.

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3 years ago

During the assembly of a certain piece of exercise equipment, 3 welds are required during different phases of the assembly proce

Karolina [17]

Answer:

99.9973 %

Step-by-step explanation:

This is a binomial probability distribution.

Since the probability of satisfactory welds = 97% = 0.97 and the probability of defective welds = 3% = 0.03.

Since there are 3 welds and we require at least one being defective, our binomial probability is

P(x ≥ 1) = 1 - P(x ≤ 0) = 1 - P(0) = 1 - ³C₀(0.03)³(0.97)⁰ = 1 - 1 × ‭0.000027‬ × 1 = 1 - 0.000027 = 0.99997‬3 × 100% = 99.9973%

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3 years ago

90 is the product of five and Diego’s age use a variable D to represent Diego’s age

Pavel [41]

Answer:

Deigo is 18years of age

explaination

$5 \times d = 90 \\ 5 d = 90 \\ 5d \div 5 = 90 \div 5 \\ d = 18$

this is how to solve it.

4 0

2 years ago

On a Saturday, the ratio of the amount of water used by household A to the amount of water use by household B was 13 : 5. Househ

Setler [38]

Step-by-step explanation:

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8 0

3 years ago

Read 2 more answers

Shota invests $2000 in a certificate of deposit that earns 2% in interest each year.Write a function that gives the total v(t) i

brilliants [131]

Answer:

The correct answer is v(t) = (principal × time × 0.02) if calculated simply and v(t) = Principal × $( 1.02) ^ {time}$ where v(t) is the interest after t years .

Step-by-step explanation:

Principal amount invested by Shota is $2000.

Interest is earned at 2% per year.

Time for which the principal is invested is t years.

Therefore let the total interest be v(t) dollars in t years.

Case 1: Simple Interest.

v(t) = (principal × time × $\frac{r}{100}$ ) = (2000 × t × 0.02) = 40t

Case 2: Compound Interest.

v(t) = Principal × $( 1+ \frac{r}{100}) ^ {t}$ - Principal = 2000 × $( 1.02) ^ {t}$ - 2000.

7 0

4 years ago