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Rus_ich [418]
3 years ago
12

tle="81 \frac{1}{2} \times 121 \frac{1}{2} " alt="81 \frac{1}{2} \times 121 \frac{1}{2} " align="absmiddle" class="latex-formula">
​
Mathematics
1 answer:
scoundrel [369]3 years ago
8 0
81.5 x 121.5= 9,902.25
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(3•x)•3-2=1 <br><br> I missed a lot of school and don’t know how to solve for x could you help me
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(3x) \times 3 - 2 = 1

(3x \times 3) - 2 = 1

9x - 2 = 1

Add sides 2

9x - 2 + 2 = 1 + 2

Simplification

9x = 3

Divide sides by 9

\frac{9x}{9}  =  \frac{3}{9}  \\

\frac{9}{9} x =  \frac{3}{9}  \\

x =  \frac{3}{3 \times 3}  \\

x =  \frac{1}{3}  \\

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3 years ago
What is 15% of 60? Create a model to prove your answer
Crazy boy [7]
Well, 15% of 60 is 9 so now you have to create a model :)

5 0
3 years ago
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Is this a 3-4th fraction
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The clock hand made a 90 degree turn. It is not a 3/4 fraction.

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Krypton-91 is a radioactive substance that decays very quickly. The function Q(t)=Qoe^-kt models radioactive decay of krypton-91
Masteriza [31]
The "k" value should have units and should be negative.
k = -.07 / seconds
Half-Life = ln (.5) / k
Half-Life = ln (.5) / -.07
Half-Life = -.693147 / -.07
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(actually, wkpedia says half-life of Krypton 91 is 8.57 seconds)

elapsed time = half-life * log (bgng amt / end amt) / log (2)
elapsed time = 9.9 * log (100 / 10) / 0.30102999566
elapsed time = 9.9 * 1 / 0.30102999566
<span><span>elapsed time = 9.9 * 3.3219280949 </span>
</span><span><span><span>elapsed time = 32.8870881395 </span> </span> </span>
<span>elapsed time = 32.89 seconds (rounded)

Source:
http://www.1728.org/halflife.htm

</span>
6 0
3 years ago
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