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lianna [129]
3 years ago
15

An element with mass 310 grams decays by 8.9% per minute. How much of

Mathematics
1 answer:
zalisa [80]3 years ago
7 0

Answer:

52.7 g

Step-by-step explanation:

We are given;

  • Initial mass of the element is 310 g
  • Rate of decay 8.9% per minute
  • Time for the decay 19 minutes

We are required to determine the amount of the element that will remain after 19 minutes.

We can use the formula;

New mass = Original mass × (1-r)^n

Where n is the time taken and r is the rate of decay.

Therefore;

Remaining mass = 310 g × (1-0.089)^19

                            = 52.748 g

                            = 52.7 g (to the nearest 10th)

Thus, the mass that will remain after 9 minutes will be 52.7 g

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On the last day of a Shakespeare class, an English teacher asked her students which play they liked most. Out of the 18 students
Vika [28.1K]

Answer:

1/3

Step-by-step explanation:

There were 18 students and six liked Much Ado About Nothing. So, you could write this as 6/18 which simplifies to 1/3.

7 0
3 years ago
Given the function defined in the table below, find the average rate of
AURORKA [14]

Answer:

Average rate of change = \frac{2}{5}

Step-by-step explanation:

Average rate of change of a function 'f' in the interval a ≤ x ≤ b is given by,

Average rate of change = \frac{f(b)-f(a)}{b-a}

We have to find the average rate of change in the interval 20 ≤ x ≤ 65

From the table attached,

f(65) = 32

f(20) = 14

Average rate of change = \frac{32-14}{65-20}

                                        = \frac{18}{45}

                                        = \frac{2}{5}

Therefore, average rate of change in the given interval is \frac{2}{5} .

7 0
3 years ago
Evaluate the following expression <br> 20/ 2 + 8
vitfil [10]

Answer:

18

Step-by-step explanation:

20/2 + 8

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20 / 2

2 / 2

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10

2 / 2

=

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Any expression divided by 1 remains the same

10 + 8 = 18

3 0
3 years ago
The graph of the function f(x) = –(x + 3)(x – 1) Which statement about the function is true
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I think the answer is 2.The function is negative for all real values of x where x < –3 and where x > 1.

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3 years ago
A high school student has started a new job. He plans to save $1 the first week, $2 the second week, $4 the third week, and $8 t
Mama L [17]
If you already know that you have . . . 

1$ after week 1
2$ after week 2
4$ after week 3
8$ after week 4

 . . . You can then tell that every week the money you save doubles (times 2) 

So to continue . . . . 
16$ after week 5
32$ after week 6
64$ after week 7
128$ after week 8
256$ after week  9
512$ after week 10 

You will then know that after ten weeks u will have 512$ which is answer choice D. 

Hope this helps! :)

3 0
3 years ago
Read 2 more answers
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