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sweet-ann [11.9K]
2 years ago
10

Help me with science plz​

Biology
1 answer:
belka [17]2 years ago
8 0

Answer:

whats the question

Explanation:

send a picture

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Answer:  Testable Question

Explanation:

  • testable questions are always about

      changing one variable to see what the

       effect is on another variable.

  • Can be answered through that involve experiments, , or surveys , investigations , observations

<h2><u>DONT FORGET TO MAKE ME BRAINILIST</u></h2>

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Cindy hypothesizes that if she adds salt to a weak acid, then its pH will be lowered. She develops the following experiment to t
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Measure the pH of solution in each beaker.
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As of 2011, an estimated _____ a0 percent of the U.S. workforce was working in agriculture-related jobs.
bixtya [17]

Answer:

In 2011 an estimated 1.65% of the US workforce was employed/working in the Agriculture-related sector of the economy

Explanation:

Agriculture has been a major source of jobs for most countries especially with developing/underdeveloped countries ranking in the highest percentage of their country's population working in this sector, while developed countries like the US have smaller percentage of the population working agriculture-related jobs. as of 2011 chad had an estimated 86.67% of their population involved with Agriculture-related jobs

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The condensation of _____ formed the early oceans. It is an important part of the water cycle.
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The condesation of water vapor                        
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g If a person takes a prescribed dose of 10 milligrams of Valium, the amount of Valium in that person's bloodstream at any time
Elenna [48]

Answer:

a. 8.1 milligrams

b. 40.07 hours

c. 8.859 milligrams

Explanation:

If a person takes a prescribed dose of 10 milligrams of Valium, the amount of Valium in that person's bloodstream at any time can be modeled by

A_{t}=10e^{-0.0173t}

Where A(t) = amount of Valium remaining in the blood after t hours

t = time or duration after the drug is taken

a. we have to calculate the amount of drug remaining in the bloodstream after 12 hours

A_{12}=10e^{-0.0173\times12}

A_{12}=10e^{-0.2076}

                = 10×0.81253

                = 8.1 milligrams

b. In this part we have to calculate the time when A(t) = 5 milligrams

5=10e^{-0.0173\timest}

\frac{5}{10}=e^{-0.0173t}

0.5 = e^{-0.0173t}

Now we take natural log on both the sides of the equation.

ln(0.5) = ln(e^{-0.0173t})

-0.69314 = -0.0173t

t = \frac{0.69314}{0.0173}

t = 40.0658

 ≈ 40.07 hours

c. In this part we have to calculate the rate, by which amount of drug will decay in the bloodstream after 7 hours.

A_{7}=10e^{-0.0173\times7}

A_{7}=10e^{-0.1211}

              = 10×0.8859

              = 8.859 milligrams

6 0
3 years ago
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