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kirill [66]
3 years ago
10

Starting with 195 grams of a radioactive isotope, how much will be left after 3 half-lives?

Mathematics
1 answer:
MrMuchimi3 years ago
4 0
After one half-life:  \frac{1}{2}\times 195=97.5 grams.

After two half-lives:  \frac{1}{2} \times 97.5=48.75 grams.

After three half-lives: \frac{1}{2} \times 48.75=24.375 grams.
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Write the expression -3x 2 + 2y 2 + 5xy - 2y + 5x 2 - 3y 2 in simplest form. Then, answer the following questions using complete
Nataliya [291]
2x2 + 5xy - 3y
there are three terms in the simplified expression
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8 0
3 years ago
I will give brainliest to first CORRECT answer.
astraxan [27]

Answer:

C. 576 ft.

Step-by-step explanation:

If the garden has a perimeter of 72feet and the lengths of each of the sides are lengthened by a factor of 8.

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That’s 72 x 8

576feet

7 0
3 years ago
Read 2 more answers
In an all boys school, the heights of the student body are normally distributed with a mean of 70 inches and a standard deviatio
almond37 [142]

Answer:

0.010

Step-by-step explanation:

We solve the above question using z score formula

z = (x-μ)/σ, where

x is the raw score = 63 inches

μ is the population mean = 70 inches

σ is the population standard deviation = 3 inches

For x shorter than 63 inches = x < 63

Z score = x - μ/σ

= 63 - 70/3

= -2.33333

Probability value from Z-Table:

P(x<63) = 0.0098153

Approximately to the nearest thousandth = 0.010

Therefore, the probability that a randomly selected student will be shorter than 63 inches tall, to the nearest thousandth is 0.010.

3 0
2 years ago
HI PLEASE ANSWER THIS QUESTION THANK YOU SO MUCH!
krek1111 [17]

1.  m³

2. cm³

3. s³

<h3>What is Unit?</h3>

A unit of measurement is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity.

1. Volume is measure in m³

2.  volume of a rectangular pencil case in cm³

3. V = s x s x s or s³

Learn more about volume here:

brainly.com/question/1324203

#SPJ1

3 0
1 year ago
Area of rectangle 12ft 6ft
Brilliant_brown [7]
12ft×6ft= area of 72ft
8 0
3 years ago
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