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3 years ago

What number adds 10 and multiplies 21

Mathematics

2 answers:

Ne4ueva [31]3 years ago

8 0

7 and 3. 7+3=10 and 7x3=21

BaLLatris [955]3 years ago

5 0

The numbers are 7 and 3.

7 + 3 = 10
7 x 3 = 21

It is easier to factor 21 than to find the addends of 10.

1, 3, 7, 21 - are factors of 21

1, 2, 3, 4, 5, 6, 7, 8, 9 - are addends of 10. Which is more numbers to consider than the factors of 21.

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Assume that adults have IQ scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equa

aleksley [76]

Answer: 0.5467

Step-by-step explanation:

We assume that the test scores for adults are normally distributed with

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Standard deviation : $\sigma=20$

Sample size : = 50

Let x be the random variable that represents the IQ test scores for adults.

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For x =115

$z=\dfrac{115-100}{20}\approx0.75$

By using standard normal distribution table , the probability the mean of the sample is between 95 and 105 :-

$P(85$

Hence, the probability that a randomly selected adult has an IQ between 85 and 115 =0.5467

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statuscvo [17]

Answer:

600

Step-by-step explanation:

Andrew has 280 points. We are told that he is 20 points short of 50% proficiency.

280 + 20 = 300

Now we know that 300 is 50% of the maximum amount of points.

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