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Romashka-Z-Leto [24]
2 years ago
13

7/9 - 2/8 × 4/9 A.5/9 B.48/72 C.20.9 D.2/3

Mathematics
1 answer:
zysi [14]2 years ago
8 0

Answer:

2/3

Step-by-step explanation:

7/9 - 2/8 x 4/9

Reduce the fraction.

7/9 - 1/4 x 4/9

Reduce the numbers:

7/9 - 1/9

Subtract the fractions.:

6/9  >  2/3

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The coordinate grid shows the graph of four equations:
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Which property of soil depends on the size of particles?
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2 years ago
A small metal bar, whose initial temperature was 10° C, is dropped into a large container of boiling water. How long will it tak
IgorC [24]

Answer

According to newton law of cooling

\dfrac{d T}{dt} = k (T - T_a)

and

T = Ce^{kt} + T_a

now At Ta = 100

T₀ = 10 °C

T₁ = 12° C

T(0) = Ce^{0} + T_a

10 = C + 100

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now,

12 = -90e^k + 100

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T(t) = -90 (\dfrac{88}{90})^t + 100

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t = 48.88 s

hence, after 48.88 s the temperature of the body will be 70°C

b) time taken to reach 98°C

T(t) = -90 (\dfrac{88}{90})^t + 100

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t = 390 s

hence, after 390 s the temperature of the body will be 98°C

5 0
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