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3 years ago

It takes an older pump twice as long to drain a certain pool as it does a newer pump. Working together, it takes the two pumps

Mathematics

2 answers:

mario62 [17]3 years ago

4 0

It takes the new pump 2.5 hour's. 5 ÷ 2 = 2.5

creativ13 [48]3 years ago

4 0

The amount of time it will take the newer pump to drain the pool working alone is 2.5 hours

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Suppose you have a bag containing 2 black marbles and 3 red marbles. You reach into the bag, select a marble, see what color it

TiliK225 [7]

Answer:

$\dfrac{9}{25}$

Step-by-step explanation:

Given that the bag contains black and red marbles.

Number of black marbles in the bag = 2

Number of red marbles in the bag = 3

Total number of marbles in the bag = Number of black marbles + Number of red marbles = 2 + 3 = 5

Let us have a look at the formula for probability of an event E, which can be observed as:

$P(E) = \dfrac{\text{Number of favorable cases}}{\text {Total number of cases}}$

$P(\text{First red marble}) = \dfrac{\text{Number of red marbles}}{\text{Total number of marbles}} = \dfrac{3}{5 }$

Now, the marble chosen at first is replaced.

Therefore, the count remains the same.

$P(\text{Second red marble}) = \dfrac{\text{Number of red marbles}}{\text{Total number of marbles}} = \dfrac{3}{5}$

Now, the <em>required probability</em> can be found as:

$P(\text{First red marble})\times P(\text{Second red marble}) = \dfrac{3}{5}\times \dfrac{3}{5} = \bold{\dfrac{9}{25} }$

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3 years ago

What is 51,487 rounded to the nearest thousand

Alchen [17]

51,000
5 in the ten thousands,
The thousands value is 1, the hundreds is 4 (less than 5 so we round down)

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3 years ago

Solve using foil method (x+9)(x+9)

Fudgin [204]

X^2+9x+9x+81
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for factoring it

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4 years ago

What is the greatest common factor of 12 and 90?

qwelly [4]

The greatest common factor (gcf) is 6.

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Use the distributive property to simplify the expression 5 ( − 1 x − 6 + 6 y )

expeople1 [14]

Answer:

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