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Zigmanuir [339]

3 years ago

8

I need to know what is

- 15 \div 3" align="absmiddle" class="latex-formula">

1 answer:

Slav-nsk [51]3 years ago

8 0

The answer is -3 because mathematically -15 divided by 3 equals -3

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A 41 gram sample of a substance that's used to detect explosives has a k-value of 0.1392. Find the substance's half life, in day

-BARSIC- [3]

Answer:

The substance half-life is of 4.98 days.

Step-by-step explanation:

Equation for an amount of a decaying substance:

The equation for the amount of a substance that decay exponentially has the following format:

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

In which k is the decay rate, as a decimal.

k-value of 0.1392.

This means that:

$A(t) = A(0)e^{-0.1392t}$

Find the substance's half life, in days.

This is t for which $A(t) = 0.5A(0)$ . So

$A(t) = A(0)e^{-0.1392t}$

$0.5A(0) = A(0)e^{-0.1392t}$

$e^{-0.1392t} = 0.5$

$\ln{e^{-0.1392t}} = \ln{0.5}$

$-0.1392t = \ln{0.5}$

$t = -\frac{\ln{0.5}}{0.1392}$

$t = 4.98$

The substance half-life is of 4.98 days.

5 0

3 years ago

Which value is needed to create a perfect square trinomial from the expression x^2+8x+___?

leonid [27]

${( \frac{b}{2}) }^{2} \\ ( { \frac{8}{2} )}^{2} \\ ( {4})^{2} \\ 16$

3 0

4 years ago

What decimal is equal to 15%?

kompoz [17]

15% is equal to 15/100

15 divided by 100 = 0.15

0.15 is your answer

hope this helps

4 0

3 years ago

Read 2 more answers

Pls help me solve this

NISA [10]

Answer:

$50

Step-by-step explanation:

12 x 30 = 360

960 - 360 = 600

600/12 = 50

3 0

3 years ago

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Is this factorable please help me.

olga2289 [7]

This can be factored into (2t - 9)(t + 7)

7 0

3 years ago