All categories

3 years ago

7n2 + 9k2 + 6 6n Submit

Mathematics

1 answer:

Akimi4 [234]3 years ago

4 0

Answer:

9 ( -10 - 10y )

Step-by-step explanation:

You might be interested in

Use the exponential decay model, Upper A equals Upper A 0 e Superscript kt, to solve the following. The half-life of a certai

Akimi4 [234]

Answer:

It will take 7 years ( approx )

Step-by-step explanation:

Given equation that shows the amount of the substance after t years,

$A=A_0 e^{kt}$

Where,

$A_0$ = Initial amount of the substance,

If the half life of the substance is 19 years,

Then if t = 19, amount of the substance = $\frac{A_0}{2}$ ,

i.e.

$\frac{A_0}{2}=A_0 e^{19k}$

$\frac{1}{2} = e^{19k}$

$0.5 = e^{19k}$

Taking ln both sides,

$\ln(0.5) = \ln(e^{19k})$

$\ln(0.5) = 19k$

$\implies k = \frac{\ln(0.5)}{19}\approx -0.03648$

Now, if the substance to decay to 78% of its original amount,

Then $A=78\% \text{ of }A_0 =\frac{78A_0}{100}=0.78 A_0$

$0.78 A_0=A_0 e^{-0.03648t}$

$0.78 = e^{-0.03648t}$

Again taking ln both sides,

$\ln(0.78) = -0.03648t$

$-0.24846=-0.03648t$

$\implies t = \frac{0.24846}{0.03648}=6.81085\approx 7$

Hence, approximately the substance would be 78% of its initial value after 7 years.

5 0

2 years ago

A bike path is 6 3/4 miles long. What whole number is closest to 6 3/4?

Naddik [55]

It'll be 7 because 3/4 is greater than 1/2 so you round it up.

3 0

3 years ago

Hi what is the answer for this?

Marat540 [252]

I believe it's A I really hope that's right

6 0

3 years ago

Read 2 more answers

I WILL GIVE BRAINLIEST<br> Answer must be simplified<br> 4x ≤ 12

alina1380 [7]

Answer: x ≤ 3

Step-by-step explanation:

4x ≤ 12

divide each side by 4

x≤3

8 0

3 years ago

I don't know if it's supposed to do with (n-2)180 <br> Also please explain :D

Sindrei [870]

Step-by-step explanation:

$sum \: of \: interior \\ \: angels \: is \: 2340 \: degrees. \\ (n−2)⋅180=2340 \\ 180n - 360=2340 \\ 180n = 2700 \\ n=15 \\ number \: of \: sides=15$

the polygon is 15 sided.

6 0

2 years ago

7n2 + 9k2 + 6 6n Submit​

7n2 + 9k2 + 6 6n Submit