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3 years ago

(20 POINTS) I need help to find the area

Mathematics

2 answers:

BARSIC [14]3 years ago

5 0

For a trapezoid:

A=(17.3+10.7)×13.4/2=28×6.7=187.6 square feet

saveliy_v [14]3 years ago

4 0

Answer:

187.6 ft^2

Step-by-step explanation:

Area of trapezoid=[(b1+b2)/2]*h

A=[(10.7+17.3)/2]*13.4

A=(28/2)*13.4

A=14*13.4

A=187.6

So the area of the trapezoid is 187.6 ft^2

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frez [133]

Answer:

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Step-by-step explanation:

Change in value:

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

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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°:

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

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

8 0

4 years ago

Can someone explained what i am supposed to do in this picture.

FinnZ [79.3K]

Well i think you are suppose to explain how OR WHAT THE CHANGE IN DECREASE Is.
Hope i helped

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4 years ago

Read 2 more answers

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quester [9]

Answer:

To determine whether a decimal is rational or not, you need to know that...

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Step-by-step explanation:

Here are examples of irrational numbers:

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Hope this helps :)

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3 years ago