In a sample of 56 bags of fertilizer, the average weight was found to be 17.2lb with a standard deviation of 0.7. Give a point e
1 answer:
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The question is incomplete. Here is the complete question.
Raoul measured the ehight of 12 different plants in his garden in April. He measured them again in June.
April Heights (in inches) 12 15 23 11 42 45 44 39 12 19 20 12
June Heights (in inches) 45 45 40 43 11 14 12 13 41 40 45 41
What is the difference between the mean height in April and the mean height in June?
Answer: The difference between means is 8.0
Step-by-step explanation: <u>Mean</u> is the average of a set of numbers.
It is calculated as:
where
x is the numbers in the set
n is how many numbers are there in the set
For heights in April, the mean is:
μ₁ = 24.5
For heights in June, the mean os:
μ₂ = 32.5
The difference between means:
μ₂ - μ₁ = 32.5 - 24.5 = 8.0
The difference between the mean height in April and in June is 8.0 inches.
3)
check the picture below.
bearing in mind that the point of tangency, the green one there, is always a right-angle, then we get that much for the distance AB.
since the satellite can emit a signal at a speed of 186,000 miles/second, how long will it be to cover AB? well, it'll just be AB/186000, which is about 0.1381 seconds.
and how long will it be to cover the distance AE? well, it'll just be AE/186000, which is about 0.11828 seconds.
of course is quicker to AE since it's closer, so the difference for both distances will be AB - AE, which is about 0.01984121052328095721 seconds.
4)
if the satellite makes a revolution, or 2π, in 24 hours, and we know the satallite is orbiting at 22000+4000 or 26000 miles from the center of the Earth, thus its circular orbit has a radius of 26000, how many miles is that?
well, Circumference of a circle is C = 2πr, if r = 26000, then C = 2π(26000), so on those 24 hours it has covered 52000π miles.
how fast must it travel then?
now if you need the rate in miles/seconds, bear in mind that an hour has 60 minutes and each minute 60 seconds, thus and hour has 60*60 seconds or 3600, thus its speed in miles/seconds will be 52000π/3600.
check the picture below.
bearing in mind that the point of tangency, the green one there, is always a right-angle, then we get that much for the distance AB.
since the satellite can emit a signal at a speed of 186,000 miles/second, how long will it be to cover AB? well, it'll just be AB/186000, which is about 0.1381 seconds.
and how long will it be to cover the distance AE? well, it'll just be AE/186000, which is about 0.11828 seconds.
of course is quicker to AE since it's closer, so the difference for both distances will be AB - AE, which is about 0.01984121052328095721 seconds.
4)
if the satellite makes a revolution, or 2π, in 24 hours, and we know the satallite is orbiting at 22000+4000 or 26000 miles from the center of the Earth, thus its circular orbit has a radius of 26000, how many miles is that?
well, Circumference of a circle is C = 2πr, if r = 26000, then C = 2π(26000), so on those 24 hours it has covered 52000π miles.
how fast must it travel then?
now if you need the rate in miles/seconds, bear in mind that an hour has 60 minutes and each minute 60 seconds, thus and hour has 60*60 seconds or 3600, thus its speed in miles/seconds will be 52000π/3600.
Answer:
Ok so first you would have to turn them into improper fractions which is
3 =
and 4
=
So now that you have made them both improper fractions you have to find common denominators.
To find common denominators you must multiply both the numerator and the denominator by the same thing. Since your oposing fraction has a denominator of 5 you can know that a even number wont go in an odd number so take and mutiply both numbers by 2 and get
. Then mutiply both numbers in
by 5 to get a common denominator.
=35 - 44 = -9 so your answer is
Step-by-step explanation: