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2 years ago

Please help it’s due in ten minutes!!!

Mathematics

1 answer:

leva [86]2 years ago

5 0

I believe it is in 2.64 years

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A sample of 400 grams of radioactive substance decays according to the function A(t) = 400e^-.046t, where t is the time in years

algol13

Answer: There will be 0.04 grams will be left in the sample after 20 years.

Step-by-step explanation:

Since we have given that

$A(t)=400e^{-0.46t}$

Here, Initial amount of radioactive substance = 400 grams

We need to find the amount of substance that will be left in the sample after 20 years.

So, t = 20 years

So, it becomes,

$A(t)=400e^{-0.46\times 20}\\\\A(t)=400e^{-9.2}\\\\A(t)=0.04\ grams$

Hence, there will be 0.04 grams will be left in the sample after 20 years.

6 0

3 years ago

−3x−6+(−1) equivalent

OLga [1]

Answer:

-3x-7

Step-by-step explanation:

Combine Like Terms:

=−3x+−6+−1

=(−3x)+(−6+−1)

=−3x+−7

6 0

2 years ago

The sum a 8 and a number h is 12

Artyom0805 [142]

H would equal to 4 (8+4=12)

7 0

2 years ago

Read 2 more answers

Financial Apps help! 15 points! - Investments

Novosadov [1.4K]

Answer: im pretty sure its b

Step-by-step explanation:

6 0

3 years ago

Convert these unlike fractions to equivalent like fractions and add them. You must use the LCD to get the answer correct. If pos

Kamila [148]

Answer:

Step-by-step explanation:

The fractions are: $\frac{1}{5}$ and $\frac{2}{3}$ . Let's take a look at the denominators: 5 and 3. The LCD of 5 and 3 is 15. 5x3=15, 3x5=15. So now we would multiply the denominators to make them the same number like this: $\frac{5}{15}$ and $\frac{10}{15}$ . Remember that if you multiply the denominator by a certain number, you must multiply the numerator by the same number as well. For example, in $\frac{2}{3}$ , we multiply 3 by 5 and 2 by 5. Same number. Now with that out of the way, let's work on the equation: $\frac{1}{5}$ + $\frac{2}{3}$ . We know it is the same as $\frac{5}{15}$ and $\frac{10}{15}$ . So now all we do is add the numerators together: 5+10=15 or $\frac{15}{15}$ . Now we have to reduce the fraction. $\frac{15}{15}$ can be reduced to 3 by dividing 15 by 5=3. The final fraction is $\frac{3}{3}$ or can be simply put as 3 since 3/3 is a whole number. That's it - you're done!

7 0

2 years ago