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ad-work [718]
3 years ago
15

What is the unit rate for 875.52 kilometers in 38.4 hours? Enter your answer, as a decimal, in the box.

Mathematics
2 answers:
serious [3.7K]3 years ago
8 0
We are given:
number of kilometers = 875.52 km
time = 38.4 hours

We need to calculate the unit rate, which means that we need to find the number of kilometers in one hour.
To do so, we will simply divide the total number of kilometers by the total time as follows:
unit rate = 875.52 / 38.4 = 22.8 km/hour
AfilCa [17]3 years ago
6 0
<span>The unit rate is given by Rate, R = Distance covered/ Time taken. So the unit rate is equal to 875.52km / 38.4 hrs = 22.8km / hr. Basically the premise is that if 875.52 Km is covered in 38.4 hours. How many kilometer is covered in one hour. And = 22.8 km/hr.</span>
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Suppose the sediment density (g/cm3 ) of a randomly selected specimen from a certain region is known to have a mean of 2.80 and
Irina18 [472]

Answer:

0.918 is the probability that the sample average sediment density is at most 3.00

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 2.80

Standard Deviation, σ = 0.85

Sample size,n = 35

We are given that the distribution of sediment density is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

Standard error due to sampling:

=\dfrac{\sigma}{\sqrt{n}} = \dfrac{0.85}{\sqrt{35}} = 0.1437

P(sample average sediment density is at most 3.00)

P( x \leq 3.00) = P( z \leq \displaystyle\frac{3.00 - 2.80}{0.1437}) = P(z \leq 1.3917)

Calculation the value from standard normal z table, we have,  

P(x \leq 3.00) = 0.918

0.918 is the probability that the sample average sediment density is at most 3.00

4 0
3 years ago
Solve the system of equations below.
trapecia [35]

Answer:

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We multiply A) by -2

A) -2x -2y  = -16 Then we add this to

B) 3x + 2y = 21

x = 5

y = 3

Second answer is correct

Step-by-step explanation:

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Which of the following is equal to the expression below?
aliina [53]

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6 0
3 years ago
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