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mart [117]
2 years ago
12

I ONLY NEED THE CHECK PART PLEASEEEE HELP ASAPPP i’ll mark brainliest !!!

Mathematics
2 answers:
inysia [295]2 years ago
7 0

Answer:

x=-10

Step-by-step explanation:

(3x+2)/4=-7

3x+2=4×-7

3x=-28-2

3x=-30

x=-10

PolarNik [594]2 years ago
4 0

Answer:

\frac{3(-10) + 2}{4}  = \frac{-30 + 2}{4} = \frac{-28}{4} = -7

Step-by-step explanation:

<u>Solve:</u>  

3x+2 = 4(-7)

3x+2 = -28

3x = -30

x = -10

<u>Check:</u>

\frac{3(-10) + 2}{4}  = \frac{-30 + 2}{4} = \frac{-28}{4} = -7

To check your answer to an equation, just plug your answer in place of x, and see if you get the same answer as the original equation.

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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
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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
A bird flies 50km everyday to collect food for his offspring and 20km to drink water. To fly this distance takes him 1 hour and
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Answer:

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Step-by-step explanation:

70km=100 minutes

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What is the ratio of purple cylinders to total cylinders, there are 7 purple and 1 yellow.
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Answer:

7:8

Step-by-step explanation:

There are 7 purple cylinders. There are 8 total cylinders (7 purple and 1 yellow). So the ratio is 7:8

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