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Nina [5.8K]
3 years ago
9

Please Help!!!! I will give brainliest!!!

Mathematics
1 answer:
san4es73 [151]3 years ago
8 0

Answer:

it would be 5.

Step-by-step explanation:

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Use only an associative property to rewrite the following expression.<br> (pk)•r=
Gennadij [26K]

Answer:

Step-by-step explanation:

(pk) * r = p * (kr)

5 0
3 years ago
(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

c. k=-0.00259

d. t=153.39838\\ minutos

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\\\\

8 0
3 years ago
I’ll give you so many point SOOOO MANY POINTS HELP IM GONNA FAIL MY CLASS
valentinak56 [21]

Answer:

502

Step-by-step explanation:

4 times 125.50 equals 502

4 0
3 years ago
At the skate park, an average of 126 bicycle per day are rented in October. This number is 10% less than the average number of b
OLga [1]
The answer is A which is 113. Hope this helped
4 0
3 years ago
Read 2 more answers
Using distributive property, factor out the GCF and rewrite 54 + 90​
Burka [1]

Answer:

144

Step-by-step explanation:

54+90=144

144-90=54

90+54=144

144-54=90

8 0
3 years ago
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