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3 years ago

Can someone please help me?

Mathematics

2 answers:

igor_vitrenko [27]3 years ago

7 0

Answer:

$A=28.26\\A=9\pi$

Step-by-step explanation:

Use the formula:

$A=\pi r^2$

Insert values

$A=3.14 *3^2$

Simplify exponent

$A=3.14 *9$

Simplify multiplication

$A=28.26$

Orrrrr....

$A=\pi *3^2\\A=\pi *9\\A=9\pi$

kaheart [24]3 years ago

6 0

Formula:

A=Pi r²

Answer:

A=28.27

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4 years ago

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3 years ago

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2 years ago

A calculator is required to obtain the final answer on this question. A solid metal sphere at room temperature 20oC is dropped i

yKpoI14uk [10]

Answer:

T = 47.1875°C

Step-by-step explanation:

Given:

Surrounding temp, Ts = 100°C

Initial Temperature ,T0= 20°C

Increase in temperature = 15°C

Final temperature, T = 20 + 15 = 35°C

Time, t = 9 seconds

Let's take Newton's law of cooling:

$T - Ts = (T_0 - Ts)e^k^t$

We'll solve for k

$35 - 100 = (20 - 100)e^9^k$

$-65 = (-80)e^9^k$

Divide both sides by -5

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Let's now find the temperature of the ball after 18 seconds in boiling water.

Use the Newton's equation again:

$T - Ts = (T_0 - Ts)e^k^t$

$T - 100 = (20 - 100)e^-0.0^2^3^0^7^1^0^4^0^5^3^*^1^8$

$T - 100 = (-80)e^-0.0^2^3^0^7^1^0^4^0^5^3^*^1^8$

$T - 100= -52.8125$

$T = 100 - 52.8125$

T = 47.1875°C

Temperature of the ball after 18 seconds in boiling water is 47.1875°C

5 0

4 years ago

Letty has $5.00 in nickels, dimes & quarters. She has 3 times as many nickels as dimes. She has 5 times as much money in qua

Volgvan

Well
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q=n
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Hope this helped :)

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4 years ago