2 years ago

The quadratic equation 4x^2 + 12x + k = 0 has equal roots. Find the value of k.

Mathematics

1 answer:

cestrela7 [59]2 years ago

3 0

Answer:Sephardic.org

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Step-by-step explanation:

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In the formula A(t) = A0ekt, A(t) is the amount of radioactive material remaining from an initial amount A0 at a given time t an

Alenkasestr [34]

Answer: 693 years

Step-by-step explanation:

Expression for rate law for first order kinetics is given by:

$A(t) =A_0e^{kt}$

k = rate constant

t = time taken for decomposition = 1

$A_0$ = Initial amount of the reactant

$A_t$ = amount of the reactant left = $A_0-\frac{0.1}{100}\times A_0=0.999A_0$

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$k=-0.001year^{-1}$

for half life : $t=t_\frac{1}{2}$

$A_t=\frac{1}{2}A_o$

Putting in the values , we get

$\frac{1}{2}A_0=A_0e^{-0.001\times t_\frac{1}{2}$

$t_\frac{1}{2}=693 years$

Thus half life of this isotope, to the nearest year is 693.

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Tamara took guitar lessons for 5.8 years. Then she took trumpet lessons for the next 3.4 years.

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The correct answer is D

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the first one

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y = 3x/3

y = x

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