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3 years ago

What the volume ?.....

Mathematics

1 answer:

user100 [1]3 years ago

8 0

Answer:

answer: Volume sa Cellphone:)

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Solve the following equation for x to find the total number of people who became members of a social networking site for a certa

ra1l [238]

X-0.8x=72
0.2x=72 /0.2
X = 360

3 0

2 years ago

A storage tank contains a liquid radioactive element with a half-life of 96 years. It will be relatively safe for the contents t

PolarNik [594]

Answer:

The tank must remain intact for 1183 years.

Step-by-step explanation:

Exponential equation for decay:

The amount of a substance after t years is given by:

$A(t) = A(0)e^{rt}$

In which A(0) is the initial amount and r is the decay rate.

A storage tank contains a liquid radioactive element with a half-life of 96 years.

This means that $A(96) = 0.5A(0)$ , and we use this to find r.

$A(t) = A(0)e^{rt}$

$0.5A(0) = A(0)e^{96r}$

$e^{96r} = 0.5$

$\ln{e^{96r}} = \ln{0.5}$

$96r = \ln{0.5}$

$r = \frac{\ln{0.5}}{96}$

$r = -0.0072$

$A(t) = A(0)e^{-0.0072t}$

It will be relatively safe for the contents to leak from the tank when 0.02% of the radioactive element remains. How long must the tank remain intact for this storage procedure to be safe?

This is t for which $A(t) = 0.0002A(0)$ . So

$A(t) = A(0)e^{-0.0072t}$

$0.0002A(0) = A(0)e^{-0.0072t}$

$e^{-0.0072t} = 0.0002$

$\ln{e^{-0.0072t}} = \ln{0.0002}$

$-0.0072t = \ln{0.0002}$

$t = -\frac{\ln{0.0002}}{0.0072}$

$t = 1183$

The tank must remain intact for 1183 years.

5 0

3 years ago

last year she had 12 records in her collection. now she has 15. what is the percent increase of her collection

pochemuha

Answer:

Her percent increase would be 25%.

Step-by-step explanation:

7 0

3 years ago

Graph the equation y = k x + 1 if it is known that the point M belongs to it:<br> M (2, −7)

Elenna [48]

Answer:y = k x + 1

(1,3)

3 = k(1) + 1

2 = 1k

k = 2

Step-by-step explanation:

7 0

2 years ago

Helpppppppppppppppppppppplppoooooo

Komok [63]

Answer:

hope it helps you plz mark me brilliantest

Step-by-step explanation:

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3 years ago

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