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Vera_Pavlovna [14]
3 years ago
12

Pls help me with all of the questions I really wasn’t listen to the teacher when he was talking. I was on my phone

Mathematics
1 answer:
Simora [160]3 years ago
6 0
<h2>Answer:</h2>

See the attached image

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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
2 years ago
If you were to roll the dice one time, what is the probability it will land on a 2?
vladimir2022 [97]

Answer:

1 out of 6

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Define the mathematical base <br>And give an example
lyudmila [28]

Answer:

Answer below

Step-by-step explanation:

A base is the number of digits in a number system. For example in the decimal number system we use the 10 digits ( 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ). So it has the base 10.

HOPE IT HELPED

6 0
3 years ago
Necesito esto para hoy y no entiendo
BaLLatris [955]

Operación: (+6)-(3). Piso Final: +3

Inicial: +8 Operación: (+8)+(+1) Piso final: +9

Inicial: +10 Operación: (+10)-(4) Piso final: +6

3 0
2 years ago
What is the x-intercept of the graph?
Umnica [9.8K]

Answer: (6,0)

Step-by-step explanation: To find the x-intercept, we plug a 0 in for y.

So we have 2x - 3(0) = 12.

Simplifying from here, we have 2x = 12.

Now divide both sides by 2 and we get <em>x = 6</em>.

So our x-intercept is 6.

This means that our line crosses the x-axis 6

units to the right of the origin or at the point (6,0).

8 0
3 years ago
Read 2 more answers
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