Given the original statement "lf a number is negative, the additive inverse is positive," what is true

1 answer:

8 0

Yes the additive inverse in postive,because the opposite of negative is postive and the opposite of subtraction is addition

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15 more than twice a number is -23

Ymorist [56]

Answer:

2x + 15 = -23

x = -19

Step-by-step explanation:

2x + 15 = -23

2x+ 15-15 = -23 -15

2x = -38

2/2x = -38/2

x = -19

3 0

4 years ago

Algebra help? 2 questions will give brainliest!!

galina1969 [7]

1) x + 3.2= -3.5
subtract 3.2 from both sides
x+ 3.2 - 3.2= -3.5 - 3.2
it cancels out on the left
x= -6.7

2) 8/9x= 32
divide both sides by 8/9
8/9x ÷ 8/9= 32 ÷ 8/9
it cancels out on the left

to divide on the right, multiply fraction by its reciprocal/inverse

x= 32 * 9/8
multiply numerators (top)

x= (32*9)/8
x= 288/8
x= 36

ANSWER: 1) x= -6.7; 2) x= 36

Hope this helps! :)

5 0

3 years ago

Scores for a common standardized college aptitude test are normally distributed with a mean of 493 and a standard deviation of 9

Tomtit [17]

Answer:

34.01% probability that his score is at least 532.1.

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:

$\mu = 493, \sigma = 95$