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3 years ago

4

Mathematics

2 answers:

konstantin123 [22]3 years ago

7 0

Answer:

30 m/s is the answer

Murrr4er [49]3 years ago

3 0

Answer: A -30m/s

Step-by-step explanation:

Change in velocity:

Δv = v 2 - v 1

Δv = - 10 m/s - 20 m/s

Δv = - 30 m/s

Your welcome :)

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If street lights are placed at most 145

Paraphin [41]

Answer:

Step-by-step explanation:

d=4 miles=4×1760 yards=7040 yards=7040×3 ft

number of lights=21120 ft

number of lights=21120/145 +1≈145.7+1=146+1=147 lights

7 0

2 years ago

The mean speed of vehicles along a stretch of highway is 56 mph with a standard deviation of 4 mph. You

Elenna [48]

The corresponding z score for speed of 62 mph, 47 mph, and 56 mph is 1.5, -2.25 and 0 respectively.

<h3>Z score</h3>

Z score is used to determine by how many standard deviations the raw score is above or below the mean. It is given by:

$z=\frac{x-\mu}{\sigma }$

Where x is raw score, μ is mean, σ is standard deviation

Given that:

σ = 4, μ = 56, hence

for x = 62:

$z=\frac{62-56}{4 } =1.5$

for x = 47:

$z=\frac{47-56}{4 } =-2.25$

for x = 56:

$z=\frac{56-56}{4 } =0$

The corresponding z score for speed of 62 mph, 47 mph, and 56 mph is 1.5, -2.25 and 0 respectively.

Find out more on Z score at: brainly.com/question/25638875

4 0

2 years ago

Need help with 14 someone plz help it's due tomorrow

Helga [31]

So if 123 x 47= 5781, 123 x 0.47= 57.81, why? because its exactly like dividing the number by 100, instead of dividing in the end, we divided one of the multipliers :)

8 0

3 years ago

In great detail, with full work done out, please find x<br> 1 + x = 2

kenny6666 [7]

Answer:

x = 1

Step-by-step explanation:

1 + x = 2

Subtract 1 form both sides,

1 + x - 1 = 2 - 1

x = 1

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2 years ago

Is the relationship linear, exponential, or neither?

irga5000 [103]

Linear because x moves up by 3 and y moves up by 7

6 0

2 years ago