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Solnce55 [7]
3 years ago
7

Explain the first to four generations of a computer​?

Computers and Technology
1 answer:
goblinko [34]3 years ago
3 0

Answer:

<u>First generation are</u>

a)they are unreliable

b)they are very costly and

c)huge in size

<u>Second generation are</u>

a)they use a transistor

b)smaller in size compared to first generation

c)they are faster than the first generation

<u>Third generation are </u>

a)its more reliable than the first generation and the second generation

b)faster than first generation and the second generation

c)consume less electricity

<u>Fourth generation are</u>

a) they are very cheap

b)they are very small in size

c)they are portable and reliable

Explanation:

explanation is in the answer

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Two machines can finish a job in StartFraction 20 Over 9 EndFraction hours. Working​ alone, one machine would take one hour long
Alborosie

<em><u>Answer</u></em>

5 hours

<em><u>Explanation</u></em>

The two working together can finish a job in

\frac{20}{9}  \: hours

Also, working alone, one machine would take one hour longer than the other to complete the same job.

Let the slower machine working alone take x hours. Then the faster machine takes x-1 hours to complete the same task working alone.

Their combined rate in terms of x is

\frac{1}{x}    +  \frac{1}{x - 1}

This should be equal to 20/9 hours.

\frac{1}{x}  +  \frac{1}{x - 1}  =  \frac{9}{20}

Multiply through by;

20x(x - 1) \times \frac{1}{x}  +20x(x - 1) \times   \frac{1}{x - 1}  =  20x(x - 1) \times \frac{9}{0}

20(x - 1)  +20x = 9x(x - 1)

20x - 20+20x = 9{x}^{2}  - 9x

9{x}^{2}  - 9x - 20x - 20x + 20= 0

9{x}^{2}  - 49x  + 20= 0

Factor to get:

(9x - 4)(x - 5) = 0

x =  \frac{4}{9}  \: or \: x = 5

It is not feasible for the slower machine to complete the work alone in 4/9 hours if the two will finish in 20/9 hours.

Therefore the slower finish in 5 hours.

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Answer:

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