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kotegsom [21]
2 years ago
11

Factor completely: –abc –5ac –4ab –20a

Mathematics
1 answer:
galben [10]2 years ago
3 0

Answer:

-a(b+5)(c+4)

Step-by-step explanation:

-abc-5ac-4ab-20\\-a(bc+5c+4b+20)\\-a*c(b+5)+4(b+5)\\-a*(b+5)(c+4)

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a train travelling at 60 km per hour completes the journey in 8 hour. How much faster would it have to travel to cover the same
antiseptic1488 [7]

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Total distance covered: 60x8 = 480

Speed needed to cover distance of 480 km in 6 hrs = 480/6 = 80 km/hr.

initial velocity : 60 km/hr.

Train needs to run faster with speed of 20km per hour to achieve same distance in 6 hrs.

Step-by-step explanation:

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3 years ago
For a population with = 100 and = 20, what is the x value corresponding to z = 1.50?
mafiozo [28]

For a population with mean (μ) = 100 and standard deviation (σ) = 20, the X value corresponding to z = 1.50 is 130.

<h3>What is a z-score?</h3>

A z-score is also referred to as a standard score and it's a measure of the distance between a raw score and the mean, when standard deviation units are used.

<h3>How to determine the value of x?</h3>

In Statistics, the standardized z-score is giving by this formula:

Z=\frac{\bar{x}\;-\;\mu}{ \sigma }

Making x the subject of formula, we have:

x = Zσ + μ

Substituting the given parameters into the formula, we have;

x = 1.50(20) + 100

x = 30 + 100

x = 130.

Read more on z-scores here: brainly.com/question/4302527

#SPJ4

Complete Question:

For a population with μ= 100 and σ = 20, what is the X value corresponding to z = 1.50?

30

101.5

115

130

6 0
2 years ago
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