Step-by-step explanation: I added all of the terms up in a calculator and this is what I got! If you were looking to subtract them then it would equal -6948.142! The answer I got was based on the picture. Hope this helps!

5 0

2 years ago

A radioactive substance decays at a rate of 25% every 10 years. Which equation represents the amount of the substance (S) remain

Lelechka [254]

Answer:

$y = 100 * (0.75)^{30$

Step-by-step explanation:

Given

$a =100$ --- Initial Amount

$r= 25\%$ every 10 years

Required

The remaining amount after 300 years

To do this, we make use of:

$y = a(1 - r)^T$

Where

r = decay rate

T = the period of decay

In 300 years, there are 30 periods of 10 years.

i.e.

$T = \frac{300}{10}$

$T = 30$

$y = a(1 - r)^T$

$y = 100 * (1 - 25\%)^{30$

$y = 100 * (1 - 0.25)^{30$

$y = 100 * (0.75)^{30$

3 0

2 years ago

Answer the question please

jeka57 [31]

Answer: 46
explanation: the top square is 3x2=6 and the bottom one is 8x5=40

3 0

2 years ago