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kozerog [31]
3 years ago
5

QUICK ANSWER THIS!!! j/-2+7=−12

Mathematics
2 answers:
VMariaS [17]3 years ago
5 0

Answer:

38

Step-by-step explanation:

j/-2=-19

j=38

Ksivusya [100]3 years ago
4 0

Answer:

38

Step-by-step explanation:

J/-2+7=-12

     -7     -7

J/-2       -19

 x-2      x-2

J=          38

I was trying to edit but it kept saying "an error occured"

I'm sorry

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What decimal part of 36 is 20.88?? (Someone please answer quick)
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Find the measure of one interior angel if a regular 23-gon
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(1 point) Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference betw
slavikrds [6]

Answer:

a. \frac{dT}{dt}=k(T-Tm); T(0)=190

b. C_{0}=122

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Step-by-step explanation:

a. Newton's law of cooling states that the speed with which a body is cooled is proportional to the difference between its temperature and that of the medium in which it is found. Then, the initial value problem is given by:

Tm=68

\frac{dT}{dt}=k(T-Tm); T(0)=190

b. The differential equation obtained is a differential equation of separable variables:

\frac{dT}{T-Tm}=kdt\\\\\int {\frac{dT}{T-Tm}}=\int{kdt}\\\\Ln|T-Tm|=kt+C\\\\T(t)=C_{0}e^{kt}+Tm=C_{0}e^{kt}+68\\\\T(0)=C_{0}e^{k(0)}+68=190\\\\C_{0}=122

c. After 33 minutes of serving the coffee has cooled to 180°:

T(33)=122e^{33k}+68=180\\\\e^{33k}=\frac{112}{122}\\\\33k=Ln(\frac{112}{122})\\\\k=-0.00259

d.

150=122e^{-0.00259t}+68\\\\Ln(\frac{150-68}{122})=-0.00259t\\\\t=153.39838\\\\

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3 years ago
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Diano4ka-milaya [45]
Y=<span>2 is your answer. Hope this helps :)</span>
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3 years ago
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