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Schach [20]
3 years ago
9

I really need help i think my brain died

Mathematics
1 answer:
lyudmila [28]3 years ago
4 0
Same cause school kinda slow bsndndndndnndnfnfnfnfn sorry I need the points
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Element X is a radioactive isotope such that its mass decreases by 59% every day. If an experiment starts out with 390 grams of
miss Akunina [59]

Answer:

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

The percentage rate of change per hour is of -2.46%.

Step-by-step explanation:

Exponential amount of decay:

The exponential amount of decay for an amount of a substance after t days is given by:

A(t) = A(0)(1-r)^t

In which A(0) is the initial amount, and r is the decay rate, as a decimal.

Element X is a radioactive isotope such that its mass decreases by 59% every day. The experiments starts out with 390 grams of Element X.

This means, respectively, that r = 0.59, A(0) = 390

So

A(t) = A(0)(1-r)^t

A(t) = 390(1-0.59)^t

A(t) = 390(0.41)^t

The function that represents the mass of the sample after t days is A(t) = 390(0.41)^t.

Hourly rate of change:

Decreases by 59% every day, which means that for 24 hours, the rate of change is of -59%. So

-59%/24 = -2.46%

The percentage rate of change per hour is of -2.46%.

5 0
3 years ago
Who wants brain i just need an answer of 75 divided by 66 without a decimal
Klio2033 [76]

Answer:

1.1

Step-by-step explanation:

If you dont want a decimal then you would just round, and get 1

7 0
2 years ago
2
melisa1 [442]

Answer:

\boxed{\sf 10}

Step-by-step explanation:

The additive number of any number is the number when added to the number gives a result of zero.

So, if we add 10 to -10 we get a result of zero.

=> -10+10

=> Zero

5 0
3 years ago
5.4x 7 \4 simplify this wat do i do ?????
Artyom0805 [142]

Hey there!☺

Answer:\boxed{9.45}

Explanation:

5.4\times\frac{7}{4}

Multiply 5.4 by 7:

5.4\times7=37.8

Now divide 37.8 by 4:

37.8/4=9.45

9.45\text{ is your answer.}

Hope this helps!☺

7 0
3 years ago
Show three ways to estimate 3/5×9 1/2 identify each method you use
Slav-nsk [51]
                                  
\frac{3}{5} x 9 \frac{1}{2}

= \frac{27}{10} = 2,7
6 0
3 years ago
Read 2 more answers
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