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Rudik [331]
3 years ago
8

A sample of rock is found to contain 100 grams of a parent isotope. How many grams of the parent isotope will remain after two h

alf-lives?
Answer







50








100








75








25
Mathematics
2 answers:
stepan [7]3 years ago
8 0
After first half life: 100/2 = 50 grams is left
After second half life: 50/2 = 25 grams is left.
Andrew [12]3 years ago
5 0

Answer:

Option D - 25

Step-by-step explanation:

Given : A sample of rock is found to contain 100 grams of a parent isotope.

To find : How many grams of the parent isotope will remain after two half-lives.

Solution : A sample of rocks contain parent isotope  = 100 gram

After one half life of the parent isotope i.e. divided by 2

\frac{100}{2}=50

After two half lives of the parent isotope means again divide one-half life by 2

 \frac{50}{2}=25

Which means 25 gram of the parent isotope will remain after two half lives.

Therefore, Option D is correct -25


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The inequality 10.45b + 56.50 < 292.67 is used to find the number of boxes (b) that can be loaded on a truck without exceedin
nordsb [41]

Question :

The inequality 10.45b + 56.50 < 292.67 is used to find the number of boxes (b) that can be loaded on a truck without exceeding the weight limit of the truck. The solution is written as {b | b < 22.6}. Which statement best describes the meaning of the solution?

The truck can hold more than 22 boxes.

The truck can hold more than 23 boxes.

The truck can hold up to 22 boxes.

The truck can hold up to 23 boxes.

Answer:

Option C: The truck can hold up to 22 boxes.

Explanation:

Given that the inequality is 10.45b + 56.50 < 292.67 is used to find the number of boxes can be loaded on a truck without exceeding the weight limit of the truck.

To determine the number of boxes, let us solve the inequality.

Thus, we have,

10.45b + 56.50 < 292.67

Subtracting both sides by 56.50, we get,

10.45b  < 236.17

Dividing both sides by 10.45, we have,

b

This means that the number of boxes that can be loaded on a truck without exceeding the weight limit of the truck should be lesser than 22.6

Therefore, the truck can hold up to 22 boxes.

Hence, Option C is the correct answer.

4 0
3 years ago
Read 2 more answers
Can someone plz help me
finlep [7]
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8 0
2 years ago
Every day Rami walks 1 mile in the morning and 1 mile in the afternoon. How many days will it take Rami to walk a total
svp [43]

Answer:

A - 5

Step-by-step explanation:

1 mile in the morning + 1 mile in the afternoon = 2 miles per day

10 miles / 2 miles = 5

5 0
2 years ago
Which of the following are true statements?
nasty-shy [4]

Answer:

I think the answer is B I guessed it.

6 0
1 year ago
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A photographer is planning to enlarge a photograph by a scale factor of 1:5 . The original photograph has an area of 154 square
Step2247 [10]
Your answer should have been 3850 in^2 

1^2/5^2 = 1/25

1/25 = 154/x
1x= 154 (25)
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3 years ago
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