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Ann [662]
3 years ago
14

There are 20 pens in a package. Ten of the pens are black, 8 are blue, and the rest are red.

Mathematics
2 answers:
icang [17]3 years ago
3 0
If there are ten black pens, eight blue pens, and twenty pens in total, then there are 2 red pens. This means that the ratio of red to black is 2:10=1:5. Hope this helps!
saul85 [17]3 years ago
3 0

Answer:  The ratio represents the number of red pens to black pens = 1:5.

Step-by-step explanation:

Given : Total pens in package = 20

Number of black pens = 10

Number of blue pens = 8

Number of red pens =   (Total pens in package) - (Number of black pens ) -(Number of blue pens )

= 20-10-8

=2

Now , the ratio represents the number of red pens to black pens =

Number of red pens : Number of black pens

=2 : 10

= 1 :5  [Dividing both sides by 2]

Thus , the ratio represents the number of red pens to black pens = 1:5.

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In a NiCd battery, a fully charged cell is composed of Nickelic Hydroxide. Nickel is an element that has multiple oxidation stat
Westkost [7]

Answer:

P(cell has at least one of the positive nickel-charged options) = 0.83.

P(a cell is not composed of a positive nickel charge greater than +3) = 0.85.

Step-by-step explanation:

It is given that the Nickel Charge Proportions found  in the battery are:

0 ==> 0.17

.

+2 ==> 0.35

.

+3 ==> 0.33

.

+4 ==> 0.15.

The numbers associated to the charge are actually the probabilities of the charges because nickel is an element that has multiple oxidation states that is usually found in the above mentioned states.

a) P(cell has at least one of the positive nickel-charged options) = P(a cell has +2 nickel-charged options) + P(a cell has +3 nickel-charged options) + P(a cell has +4 nickel-charged options) = 0.35 + 0.33 + 0.15 = 0.83.

Or:

P(a cell has at least one of the positive nickel-charged options) = 1 - P(a cell has 0 nickel-charged options) = 1 - 0.17 = 0.83.

b) P(a cell is not composed of a positive nickel charge greater than +3) = 1 - P(a cell is composed of a positive nickel charge greater than +3)

= 1 -  P(a cell has +4 nickel-charged options)  '.' because +4 is only positive nickel charge greater than +3      

= 1 - 0.15

=  0.85

To summarize:

P(cell has at least one of the positive nickel-charged options) = 0.83!!!

P(a cell is not composed of a positive nickel charge greater than +3) = 0.85!!!

8 0
3 years ago
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