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Ludmilka [50]
2 years ago
9

That was my grandson question I haven’t a clue what that mean

Mathematics
1 answer:
Eduardwww [97]2 years ago
6 0
That would be the zero identity property. Hope it helps!

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The results of the math exam showed that three eighths of the students made an “A” and one third of them made a “B”. In total, h
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Answer:

b the answer is b

Step-by-step explanation:

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The roots of the equation 2x^2+3x-5=0 are
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4.55 rounded to the nearest hundredth
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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

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C = -90

now,

12 = -90e^k + 100

e^k = \dfrac{88}{90}

k = ln{\dfrac{88}{90}}

at time equal to t

T(t) = 70

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

70 = -90(\dfrac{88}{90})^t + 100

(\dfrac{88}{90})^t = \dfrac{1}{3}

t\times ln(\dfrac{88}{90}) = ln(\dfrac{1}{3})

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

98 = -90(\dfrac{88}{90})^t + 100

(\dfrac{88}{90})^t = \dfrac{1}{45}

t\times ln(\dfrac{88}{90}) = ln(\dfrac{1}{45})

t = 390 s

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

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2 years ago
A company's annual profit increases by $2,500 per year. In 2000, the profit of the company was $50,000. What
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