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3 years ago

What fraction of a given sample of radioactive nuclide remains after four half lives?

2 answers:

7 0

<span>1 half-life: 1/2 left

2: half of that, or 1/4

3: half of that, or 1/8

4: half of that, or 1/16

. (1/2)^4 = 1/16
so</span><span>after four half lives it would be 1/16
so correct option is D
</span>

Black_prince [1.1K]3 years ago

5 0

I believe the answer is D. 1/16.

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The Question is in the file below. (Khan Academy)

galben [10]

That little squaer angle means right angle or 90 degrees

the black line and the red line cross

therefor the oposte angles are eqal measure
7x=90+x
solve
minus x
6x=90
divide 6
x=15

x=15

5 0

3 years ago

The high school graduating class of 2010 was 260 people. Five years later the high school graduating class was 320 people. By ap

jeka94

Answer:

The high school graduating class changed by approximately 23%

Step-by-step explanation:

we have

The high school graduating class of 2010 was 260 people

Five years later the high school graduating class was 320 people.

we know that

260 people represent the 100%

The difference is (320-260)=60 people

using proportion

Find out what percentage represent 60 people

Let

x ----> the percentage that represent 60 people

$\frac{260}{100\%}=\frac{60}{x}\\\\x= 100\%(60)/260\\\\x=23.1\%$

therefore

The high school graduating class changed by approximately 23%

3 0

3 years ago

What is the discriminante of 9x^2+10x

Leni [432]

The discriminant of y=ax^2+bx+c is b^2-4ac

given
9x^2+10x+0
a=9
b=10
c=0

discriminant=10^2-4(9)(0)=100-0=100

the discriminant is 100

6 0

3 years ago

If 6 tomatoes are for $4, how much does 15 tomatoes cost?

Mariana [72]

$22.50 is the cost of 15 tomatoes

3 0

3 years ago

5T+1D=99 what is t and d

LenaWriter [7]

Answer: 12

Step-by-step explanation:

3 0

3 years ago