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2 years ago

Solve the inequality 8x - 10 > 7x + 20.

Mathematics

1 answer:

IrinaK [193]2 years ago

8 0

Keep the inequality sign the same way round then put all the 'x's on one side.

x > 30

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How are your finances connected to your beliefs? Own words

Liula [17]

Answer:

Due to religion you may be obligated to donate 10% or something of that matter.

Step-by-step explanation:

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2 years ago

A professor gives her 100 students an exam; scores are normally distributed. The section has an average exam score of 80 with a

frozen [14]

Answer:

6.18% of the class has an exam score of A- or higher.

Step-by-step explanation:

When the distribution is normal, we use 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 question, we have that:

$\mu = 80, \sigma = 6.5$

What percentage of the class has an exam score of A- or higher (defined as at least 90)?

This is 1 subtracted by the pvalue of Z when X = 90. So

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

$Z = \frac{90 - 80}{6.5}$

$Z = 1.54$

$Z = 1.54$ has a pvalue of 0.9382

1 - 0.9382 = 0.0618

6.18% of the class has an exam score of A- or higher.

4 0

2 years ago

First-person to answer correctly with an explanation gets Brainliest

zzz [600]

Answer:

it has to be a or d

Step-by-step explanation:

they have 4000 in 1996 but we want 1991.so we get 15 percent of least time but i belive its d

7 0

2 years ago

) If the pattern shown continues, how many black keys appear on a portable keyboard with 49 white keys? Suggestion: use equivale

andriy [413]

Answer:

Step-by-step explanation:

Here we see 5 black keys for every 7 white keys.

So the ratio is 5:7

If we need 49 white keys, find the amount we scale the original ratio by:

49/7 = 7

So we are scaling by a factor of 7.

The number of black keys would be 5 * the scale of 7. = 35

So there should be 35 black keys.

5 0

2 years ago

Read 2 more answers

Hellen invested 20,000 that earns 4.68% compounded monthly for four years00 earn 4.68% compounded monthly for 4 years future val

Goshia [24]

Answer:

24,108.59

Step-by-step explanation:

The future value formula seems applicable.

FV = P(1 +r/n)^(nt)

FV = 20,000(1 +0.0468/12)^(12·4) = 20,000(1.0039^48)

FV ≈ 24,108.59

4 0

3 years ago