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Reika [66]
3 years ago
14

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
Zepler [3.9K]

Step-by-step explanation:

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

\dfrac{d}{dt}[x(t)] = \dot{x}(t) = 0

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

\dot{x}(t) = 6t^2 - 42t + 72

Equating this to zero, we get

6t^2 - 42t + 72 = 0 \Rightarrow t^2 - 7t + 12 = 0

This is a familiar quadratic equation whose roots are

t = \dfrac{-b \pm \sqrt{b^2 - 4ac}}{2a}

\;\;\;= \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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3 years ago
The French club is sponsoring a bake sale to raise at least $305. How many pastries must they sell at $2.05 each in order to rea
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Answer:

149 whole pastries with an extra .45 cents

or 148.78 for exact money

Step-by-step explanation:

plato

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2<br> 3<br> x +<br> 1<br> 2<br> y = 2<br> 3<br> 8<br> x +<br> 5<br> 6<br> y = −<br> 11<br> 2
Allushta [10]

Answer:

The answer is in the image below

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4 years ago
A box contains 6 red balls, 7 green balls and 5 blue balls. each ball is of different size. the probability that the red ball se
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6/18 good luck!!!!!!!!!!!!!!!!!!!
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Which is the mode of this data?<br><br> 12, 19, 22, 17, 15, 18, 15, 14, 16
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REMEMBER: The mode is the value that appears most frequently in a data set.
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