3 years ago

21 times a number increased

Mathematics

2 answers:

IRINA_888 [86]3 years ago

8 0

Answer:

Step-by-step explanation:

21x + 6 = 3x + 60 subtract 3x from both sides

(21x-3x) + 6 = 60

18x + 6 = 60 subtract 6 from both sides

18x= 60-6

18x= 54 divide by 18

x =3

Leokris [45]3 years ago

6 0

Answer: the number is 3

Step-by-step explanation:

This can be written mathematically as

21y + 6 = 60 + 3y

21y - 3y = 60 - 6

18y = 54

y = 54/18 = 3

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It is known that 10% of the calculators shipped from a particular factory are defective. what is the probability that at least o

seraphim [82]

P = 10% = 0.1
q = 1 - 0.1 = 0.9
P(at least one defective calculator) = P(1) + P(2) + P(3) + P(4) = 1 - P(0)

The brobability of a binomial distribution is given by
$P(x)=^nC_xp^xq^{n-x}$
where: n = 4
$P(0)=^4C_0(0.1)^0(0.9)^4=1\times1\times0.6561=0.6561$
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P(at least one defective calculator) = 1 - 0.6561 = 0.3439

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4 years ago

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expeople1 [14]

Answer:

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