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Darina [25.2K]
3 years ago
14

A car that travels 20 miles in LaTeX: \frac{1}{2}1 2 hour at constant speed is traveling at the same speed as a car that travels

30 miles in LaTeX: \frac{3}{4}3 4 hour at a constant speed. Both cars go miles in LaTeX: \frac{1}{4}1 4of an hour (or 15 minutes). Both cars will travel miles in 1 hour.
Mathematics
1 answer:
charle [14.2K]3 years ago
5 0

Answer:

10 miles per 1/4 hour

40 miles per hour

Step-by-step explanation:

Given that:

A car travels 20 miles in 1/2 hour

Miles traveled per hour :

(20 * 2) / 1 = 40 miles per hour

Mile traveled in 1/4 hour :

Distance = speed * time

Distance = 40 mph * 1/4 = 10 miles per 1/4 hour

Car traveling 30 miles in 3/4 hours

(30 * 4) /3 = 120 / 3 = 40 miles per hour

Distance = 40 mph * 1/4 = 10 miles per 1/4 hour

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Please help with this question
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sin( -∅ )

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Step-by-step explanation:

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3 years ago
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Step-by-step explanation:

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Sales of a new line of athletic footwear are crucial to the success of a newly formed company, Fleet Shoes. Fleet wishes to esti
Murrr4er [49]

Answer:

The number of weeks required = 216 weeks

Step-by-step explanation:

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= 1 - 0.95

= 0.05

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The Critical value for Z :

Z_{\alpha/2} =Z_{0.05/2}  \\ \\  = Z_{0.025} =  1.96

The number of weeks( i.e the sample size (n) ) required is :

n = (\dfrac{Z_{\alpha/2} \times \sigma}{E})^2

n = (\dfrac{1.96 \times 1500}{200})^2

n = (14.7)^2

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8 0
3 years ago
The weights of a sample of college textbooks has a bell-shaped distribution with a mean of 8.1 p o u n d s ( l b s ) and a stand
weeeeeb [17]

Answer:

The interval    ( 1,8 ; 14,4 ) will contains 99,7 % of all values      

Step-by-step explanation:

For Normal Distribution  N ( μ ; σ ) the Empirical Rule establishes that in the intervals:

( μ  ±  σ )   we find  68,3 % of all values

( μ  ±  2σ ) we find  95,4 % of all values

( μ  ±  3σ ) we find  99,7 % of all values

Then we have a normal distribution  N ( 8,1 ; 2,1 )

3*σ  =  3* 2,1 = 6,3

And   8,1 - 6,3  = 1,8             8,1  + 6,3  = 14,4

Then the interval    ( 1,8 ; 14,4 ) will contains 99,7 % of all values      

4 0
3 years ago
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