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Advocard [28]
4 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]4 years ago
7 0
The rock is about 7
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This is my last question by the way
Leni [432]

Part A:

There are 25 blocks for the length, and the length of each is 5.5 inches. 5.5x25=137.5

There are 9 blocks for the height, and each is 2.75 inches. 2.75x9=24.75

Since we're trying to find how much longer the length is to the width, we find the difference. 137.5-24.75=112.75

So part A answer is <em><u>112.75 (or 112¾)</u></em>

Part B:

We know the length is 137.5 and the height is 24.75. To find how many times longer the length is, we need to divide to see how many 24.75 can go into 137.5.

137.5÷24.75=5.55

So the answer to part B is <u><em>5.55. Given the context, the answer would probably be 5, because that's how many entire height can fit.</em></u>

<u><em /></u>

Sorry if it's wrong lol

8 0
3 years ago
What is your estimate for the number of airline flights in a year?
Firdavs [7]
The answer is between 45,000,000-65,000,000
8 0
3 years ago
If the point (a,3) lies on the graph of the equation 5x + y = 8, then a=<br>a.01<br>b.0-1<br>c.0-7​
fomenos

Answer:

A (a = 1)

Step-by-step explanation:

A coordinate point is always in the form (x,y) that means the first point is always x-coordinate and the second point is always y-coordinate.

The equation given is:

5x + y = 8

The point is (a,3), so that means x = a and y = 3

We substitute the values into the equation and find a. Shown below:

5x + y = 8

5(a) + (3) = 8

5a + 3 = 8

5a = 8 - 3

5a = 5

a = 5/5

a = 1

Answer choice A is right

6 0
3 years ago
Someone please help me
Irina18 [472]

Answer:

a) Angle XBC = 55° because it's a corresponding angle

AXY = XBC

b) 180° - (55° × 2) = 70°

7 0
3 years ago
PLEASEEE HELPPPPP MEEEEE IRREGULARR SHAPE AREA OF BOTHH
kherson [118]

Answer:

I think The White one is 3.61 and the purple is 10....

Step-by-step explanation:

we just divide the shapes into separate and find the area of each separate shape

3 0
3 years ago
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