3 years ago

The sum of my number and two and two thirds is seven. What is my number?

Mathematics

1 answer:

aniked [119]3 years ago

3 0

Answer:

1,2,3,5

Step-by-step explanation:

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Vlad1618 [11]

The common factor is 7 so its

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Plutonium–238 has a yearly decay constant of 7.9 × 10-3. If an original sample has a mass of 15 grams, how long will it take to

eduard

The answer is 28 years

At = A0 * e^(-k * t)
At = 12 g
A0 = 15 g
k = 7.9 × 10^-3 = 0.0079
t = ?

12 = 15 * e^(-0.0079 * t)
12/15 = e^(-0.0079 * t)
0.8 = e^(-0.0079 * t)

Logarithm both sides (because ln(e) = 1:
ln(0.8) = ln(e^(-0.0079 * t))
ln(0.8) = (-0.0079 * t) * ln(e)
-0.223 = -0.0079 * t
t = -0.223 / -0.0079
t = 28.23
t ≈ 28 years

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3 years ago

Simplify. 3/5 +(− 1/4 ) 7/10 Enter your answer, in simplest form, in the boxes.

vitfil [10]

3/5+(-7/40)

=3/5-7/40

=24/40-7/40

=17/40

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4 years ago

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What is the number 0.000706 written in scientific notation?

Alex17521 [72]

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Step-by-step explanation:

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Simplify the expression:<br><br> 3x (4x-6)<br> —————<br> 2x(3x)

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Answer:

$=\frac{2x-3}{x}$

Step-by-step explanation:

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4 years ago