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Advocard [28]
3 years ago
7

A certain element has a half life of 4.5 billion years. a. You find a rock containing a mixture of the element and lead. You det

ermine that 60​% of the original element​ remains; the other 40​% decayed into lead. How old is the​ rock? b. Analysis of another rock shows that it contains 5​% of its original​ element; the other 95​% decayed into lead. How old is the​ rock?
Mathematics
1 answer:
oee [108]3 years ago
7 0
The rock is about 7
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Please help me I will give you alot of points​
emmasim [6.3K]
I would say it’s 240
7 0
3 years ago
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N^2- n - 12 = (n + 3)(___)
Nat2105 [25]

Answer:

n^2 - n - 12 = (n+3)(n-4)

Step-by-step explanation:

3 times - 4 = -12 ( two numbers when multiplied = -12, when added=-1)

3 + -4 = -1

4 0
2 years ago
Gina wrote the number 43,628. Then she used the same digits to write a new number. In the new number, she moved the digit 6 one
vivado [14]
The 1,000s place because she was in the 100s and you moved 6 to the left which makes the number higher.
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3 years ago
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Explain: What is the solution to this system of equations? <br><br> 2x+y=20 <br> 6x-5y=12
bazaltina [42]

Answer:

solution set is (x,y) = (7,6)

Step-by-step explanation:

solving by substitution method

2x +y=20--------------1

6x-5y=12---------------2

from equation 1, solve for y

2x+y=20

y= 20-2x------equation 3

adding value of y in equation 2

6x-5y=12

6x-5(20-2x)=12

6x-100+10x=12

16x= 12+100

16x= 112

x= 112/16

x=7

adding value of x in equation 3

y= 20-2x

y= 20- 2(7)

y=20-14

y=6

so solution set (x,y) = (7,6)

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3 years ago
Solve these questions. Pls show your work.
zhannawk [14.2K]
I solved it but don’t know how to show my work
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3 years ago
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