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satela [25.4K]
3 years ago
12

Is the relation a function? {(-2, 3) (1, 2) (0, -1) (3, 1)}

Mathematics
2 answers:
Alex3 years ago
4 0

Answer:

yes

Step-by-step explanation:

givi [52]3 years ago
3 0
Yes because none of the domain is the same
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A dance school has 63 ballet dancers a 42% of the total number of dancers in the score ballet dancers what is the total number o
melamori03 [73]
42% of what is 63

0.42x = 63
x = 63/0.42
x = 150

There are 150 dancers in the school
3 0
3 years ago
Solve 4x−9y=13 for y.
Irina18 [472]

Answer:

y =  -  \frac{13}{9}  +  \frac{4}{9} x

Step-by-step explanation:

4x - 9y = 13

4x - 9y - 4x = 13 - 4x

- 9y = 13 - 4x

y = 9y \div (9) = (13 - 4x) \div ( - 9)

y = (13 - 4x) \div( - 9)

y = 13 \div ( - 9) - 4x \div ( - 9)

y =  - 13 \div 9 - 4x \div ( - 9)

y =  -  \frac{13}{9}  - 4x \div ( - 9)

y =  -  \frac{13}{9}  + 4x \div 9

\boxed{\green{y =  -  \frac{13}{9}  +  \frac{4}{9} x, x E R}}

8 0
3 years ago
IQ scores are known to be normally distributed. The mean IQ score is 100 and the standard deviation is 15. What percent of the p
Masja [62]

Answer:

47.06% of the population has an IQ between 85 and 105.

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

\mu = 100, \sigma = 15

What percent of the population has an IQ between 85 and 105?

This is the pvalue of Z when X = 105 subtracted by the pvalue of Z when X = 85. So

X = 105

Z = \frac{X - \mu}{\sigma}

Z = \frac{105 - 100}{15}

Z = 0.33

Z = 0.33 has a pvalue of 0.6293.

X = 85

Z = \frac{X - \mu}{\sigma}

Z = \frac{85 - 100}{15}

Z = -1

Z = -1 has a pvalue of 0.1587

So 0.6293 - 0.1587 = 0.4706 = 47.06% of the population has an IQ between 85 and 105.

5 0
3 years ago
Find the rate as a ratio of distance to time<br> 126 yd . 7 days
RSB [31]
7.5 yards every hour :) Hope that helps
8 0
3 years ago
Read 2 more answers
What decimals round to 15 when rounding to the nearest whole number?​
joja [24]

Answer:

14.5, 14.6, 14.7, 14.8, 14.8, 14.9, 15.0, 15.1, 15.2, 15.3, 15.4

Step-by-step explanation:

4 0
3 years ago
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