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tangare [24]
3 years ago
5

6. If f(x) = –8 – 5x, what is f(–4)? f(–4) = 12 f(–4) = –28 f(–4) = –12 f(–4) = 28

Mathematics
2 answers:
ELEN [110]3 years ago
8 0

For this case we have a function of the form:

y = f (x), where:

f (x) = - 8-5x

We want to know the value of the function when x = -4, that is, f (-4).

Substituting we have:

f (-4) = - 8-5 (-4)

We have by law of multilplication of signs that:

- * - = +\\f (-4) = - 8 + 20

Different signs are subtracted and the sign of the major is placed.

f (-4) = 12

Answer:

Option A

Ivan3 years ago
7 0

Answer:

f (-4) = 12.

Step-by-step explanation:

If f(x) = –8 – 5x, what is f(–4)?

substitute -4 to ur value of x

that is f(-4)= -8 -5(-4)

f(-4) = -8+20

f(-4) =12.

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Jlenok [28]

Answer:

Luis would need to have a SAT score of 574.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Nicole's z-score:

ACT scores have a mean of about 21 with a standard deviation of about 5, which means that \mu = 21, \sigma = 5

Nicole gets a score of 24, which means that X = 24. Her z-score is:

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

Z = \frac{24 - 21}{5}

Z = 0.6

What score would Luis have to have on the SAT to have the same standardized score(z-score) as Nicole's standardized score on the ACT?

Luis would have to get a score with a z-score of 0.6, that is, X when Z = 0.6.

SAT scores have a mean of about 508 with a standard deviation of about 110, which means that \mu = 508, \sigma = 110.

The score is:

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

0.6 = \frac{X - 508}{110}

X - 508 = 0.6*110

X = 574

Luis would need to have a SAT score of 574.

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6 0
3 years ago
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