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inn [45]
3 years ago
13

the half-life of isotope X is 2.0 years. How many years would it take for a 4.0mg sample of X to decay and have only 0.50 mg of

it remain
Mathematics
1 answer:
shepuryov [24]3 years ago
4 0

After 2.0 years, the 4.0 mg sample decays to 2.0 mg.

After another 2.0 years (total 4.0 years), the 2.0 mg sample decays to 1.0 mg.

And after another 2.0 years (total 6.0 years), the 1.0 mg sample decays to 0.50 mg.

So it takes 6.0 years for 4.0 mg to decay to 0.50 mg.

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Homework Progress<br> 0<br> Find the nth term of the following sequence: 4 7 12 19 28
just olya [345]

<em>Answer:</em>

n²+3

<em>Explanation:</em>

The differences between the terms are not the same, so this is not "linear". Knowing that the sequence may have started with a 1, you can try subtracting the first number with a number to get 1, and use that number to subtract the rest.

4 - 3 = 1
7 - 3 = 4
12 - 3 = 9
19 - 3 = 16
28 - 3 = 25

In this case, subtracting 3 to all the numbers gave us perfect squares! So this means the nth term has to do with squaring the number and adding three afterward! This can be checked.

√1 = 1
√4 = 2
√9 = 3
√16 = 4
√25 = 5

As we found the values of these terms by subtracting three first and then finding its square root, the nth term will be the opposite; squaring and then adding three! Again, this can be checked!

1² + 3 = 4
2² + 3 = 7
3² + 3 = 12
4² + 3 = 19
5² + 3 = 28

Hope this helps !! :D

5 0
1 year ago
Determine the perimeter of a equilateral triangle with the sides of 28 cm.
Arada [10]

Answer:

84

Step-by-step explanation:

28*3

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3 0
3 years ago
If the circumference of two circle are in the ratio 2:3, then their areas are in the ratio of
maxonik [38]

Answer:

4:9

Step-by-step explanation:

To take the scale factor from distance to area, we square it

2:3  distance

Square each term

2^2 : 3^2  area

4:9

6 0
3 years ago
Solve the equation 23(9+x)=−5(4−x).
NemiM [27]

Answer:

x= -\frac{277}{18}

Step-by-step explanation:

7 0
2 years ago
Need help, please what is the Domain<br> Range<br> Thanks
s2008m [1.1K]

Answer:

See below.

Step-by-step explanation:

The domain which is all the posible values of x is: x is real and  in the interval

[1, 6].

The range is real f(x) in the interval [1, 7].


5 0
3 years ago
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