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4 years ago

Ryan runs 100 m two times. His times were 14.19 s and 13.78 s.

Mathematics

2 answers:

OLEGan [10]4 years ago

6 0

Answer is 4.04 by adding both of the time of each then subtracting then from each others time

ZanzabumX [31]4 years ago

4 0

Answer:

4.04

Step-by-step explanation:

take the number 14.19 and add that to 13.78, you get 27.97.

Now take 15.77 and add that to 16.24, you get 32.01.

Now take 32.01 and 27.97 and subtract them.

You get 4.04.

And thats your answer

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4 years ago

The ph of vinegar is 2.9 and the ph of milk is 6.6. How many times greater is the hydrogren ion concentration of vinegar than of

shutvik [7]

Answer:

Step-by-step explanation:

H+ is the hydrogen ion concentration.

This problem requires the use of solving log equation.

PH of vinegar is 2.9, lets find the number of hydrogen ions in it by using the equation:

$PH=-Log[H^{+}]\\2.9=-Log[H^+]\\-2.9=Log_{10}[H^+]$

Note: Log is normally base 10 if not specified

Now, to solve, we use exponential to log conversion formula shown below:

$Log_{z}x=b\\z^b=x$

Now lets solve:

$-2.9=Log_{10}[H^+]\\H^+=10^{-2.9}\\H^+=0.001259$

Now, the PH of milk is 6.6, so we follow same procedure and find the number of hydrogen ion in milk. Shown below:

$PH=-Log[H^{+}]\\6.6=-Log[H^+]\\-6.6=Log_{10}[H^+]\\H^+=10^{-6.6}\\H^+=0.0000002512$

So, to find how many times it is greater, we divide first answer we found by the second answer:

$\frac{10^{-2.9}}{10^{-6.6}}\\=5011$

That is about 5000 times, answer D is right.

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3 years ago