3 years ago

What does a + a equal to

Mathematics

1 answer:

Sav [38]3 years ago

3 0

2a because you are added the same thing together... making it 2a

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A particle moves along the x-axis so that at time t ≥ 0 its position is given by x(t) = 2t3 - 21t2 + 72t - 53. At what time t is

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Step-by-step explanation:

The particle is at rest when the derivative of x(t), which is its velocity, is zero, i.e.,

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Since $x(t) = 2t^3 - 21t^2 + 72t - 53,$ its derivative is

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Equating this to zero, we get

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This is a familiar quadratic equation whose roots are

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$\;\;\;= \dfrac{7 \pm \sqrt{(7)^2 - 4(1)(12)}}{2}$

$\;\;\;= \dfrac{7 \pm 1}{2}$

$\;\;\;= 3\;\text{and}\;4$

This means that the particle will be at rest at t = 3 and t= 4.

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149 whole pastries with an extra .45 cents

or 148.78 for exact money

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