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r-ruslan [8.4K]
3 years ago
10

Which property justifies

Mathematics
1 answer:
algol [13]3 years ago
5 0
B - commutative.......
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A thermometer is taken from a room where the temperature is 23oC to the outdoors, where the temperature is −9oC. After one minut
Helga [31]

Answer:

(a)\ 15\textdegree C\\(b)\ After\ 3\ minutes\ and\ 52.5\ Seconds\ from\ start

Step-by-step explanation:

Temperature in the room =23\textdegree C

Decrease in the temperature(outdoors)=23-15=8\textdegree C in 1\ minute.

Rate of decrease=8\textdegree C/minute

Let\ after\ x\ minutes\ temperature\ is\ y\\y=23-8x\ \ \ \ y\geq -9\textdegree C

(a) After 4\ more\ minutes\ total\ time\ is=1+4=5\ minutes

y=23-5\times 8\\y=-17\\

But it is not possible as outdoor temperature is -9\textdegree C so after -9\textdegree C temperature decrease will not occur.

Hence after 4 more minutes temperature=-9\textdegree C

(b) Let after t\ minutes temperature is -8\textdegree C

Here x=t,\ y=-8\textdegree C

-8=23-8x\\8x=23+8\\8x=31\\x=\frac{31}{8}\\x=3.875\ minutes=3\ minutes\ and\ 52.5\ seconds

3 0
3 years ago
12=a+5b solve for a. I think the answer is 12-5b=a but that's probably wrong
pychu [463]
YOU ARE RIGHT! SO DON'T SWEAT!

7 0
3 years ago
Can anyone show me how To do this! Please
Maslowich

Answer:

Step-by-step explanation:

7 0
3 years ago
Which equation represents a population of 370 animals that increases at an annual rate of 11% ?
Olegator [25]

The equation represents a population of 370 animals that increases at an annual rate of 11% is .

<h3>What is an exponential function?</h3>

It is defined as the function that rapidly increases and the value of the exponential function is always positive. It denotes with exponent y = a^x

where a is a constant and a>1.

Given that,

A population of 370 animals that increases at an annual rate of 11%

a = 370, r = 11%

p=a(1+r)^{t}

  = 370(1+0.11)^{t}

p  =  370(1.11)^{t}

Hence, The equation represents a population of 370 animals that increases at an annual rate of 11% is .

To learn more about exponential function from the given link:

brainly.com/question/24429075

#SPJ4

3 0
2 years ago
According to​ Charles's law, if the pressure is held​ constant, the volume of a gas varies directly with the temperature measure
Ksju [112]

Answer:

V₂ = 252 cm³

Step-by-step explanation:

Charles's law = If the pressure is held​ constant, the volume of a gas varies directly with the temperature measured on the Kelvin scale.

Mathematically, V=kT

\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}

We have, V₁ = 192 cm³, T₁ = 112 K, T₂ = 147 cm³, V₂ = ?

Using the above relation of Charles's law :

V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{192\times 147}{112}\\\\V_2=252\ cm^3

So, the new temperature is 252 cm³.

7 0
3 years ago
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