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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

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
soafter four half lives it would be 1/16
so correct option is D

Black_prince [1.1K]3 years ago

5 0

I believe the answer is D. 1/16.

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For what value of b is y = 4 a solution to the equation y + 2 = by +8

Aleksandr [31]

b = -0.5

4 + 2 = - 0.5 * 4 + 8

6 = -2 + 8

6 = 6

Which is true, Therefore the answer is -0.5

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2 years ago

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Is 600 + 2 the expanded form of 632? Explain how you know.

Anton [14]

If i remember correctly then the expanded form of 632 is

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3 years ago

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8. Janine has 3/5

Scorpion4ik [409]

Answer:

Part a) Each friend will receive $\frac{3}{10}\ pounds$

Part b) $\frac{19}{20}\ pounds$ or $0.95\ pounds$

Step-by-step explanation:

Part a)

we know that

To calculate the weight of peanuts in pounds that each friend will

receive, divide the total pounds of peanuts by two

$\frac{(3/5)}{2}=\frac{3}{10}\ pounds$

Part b)

Let

x-----> pounds of extra peanuts the friend needs to end up with 2 pounds of peanuts

we know that

$2=x+\frac{3}{10}+\frac{3}{4}$

Solve for x

$x=2-(\frac{3}{10}+\frac{3}{4})$

Multiply by 40 both sides

$40x=80-(12+30)$

$40x=38$

$x=\frac{38}{40}\ pounds$

Simplify

$x=\frac{19}{20}\ pounds$ or $x=0.95\ pounds$

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3 years ago

When an oil tank is full, it contains 5¼ gallons. How many gallons does it hold when full?

Svet_ta [14]

Answer:

$5\frac{1}{4}$

Please Mark Brainliest If This Helped!

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2 years ago

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Find the value of x A. 40 degrees B. 80 degrees C. 90 degrees D. 160 degrees

mr Goodwill [35]

Answer:

b 80 deg

Step-by-step explanation:

The measure of an arc of a circle equals the measure of its central angle.

Since the central angle has measure 80 degrees, x is also 80 degrees.

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2 years ago