It is A x= -9 I just did the assignment so yes, this means it is -9 I hope m answer helps you out.
Answer:
122.5 lbs
Step-by-step explanation:
The relation between force, wind speed, and area can be written ...
f = ks²a
for some wind speed s and area a.
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The constant of proportionality, k, can be found from the given data.
64.8 = k(18²)(500) . . . force in pounds, area in square feet, speed in mph
k = 64.8/(324×500) = 0.0004
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Using the equation with the second set of data, we have ...
f = 0.0004(35²)(250) = 122.5 . . . . pounds
The force on the 250 square foot sail would be 122.5 pounds.
Answer:
a) 
b) First we need to calculate the variance given by this formula:
And the deviation would be:
c) 
And using the cdf we got:
d) 
Step-by-step explanation:
For this case we define the random variable X who represent the customers charge, and the distribution for X on this case is:
Part a
For this case the average is given by the expected value and we can use the following formula:
Part b
First we need to calculate the variance given by this formula:
And the deviation would be:
Part c
For this case we want to find the percent between 600 and 889, so we can use the cumulative distribution function given by:
And we can find this probability:
And using the cdf we got:
Part d
And using the cdf we got:
The total if all 236 coins were nickels would be $11.80, which is $3.95 short of the actual amount.
Replacing a nickel with a dime adds $0.05 to the total value, so there must have been $3.95/$0.05 = 79 such replacements.
There are 79 dimes.
There are 236 -79 = 157 nickels.
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Using the given variables, the problem statement gives rise to two equations. One is the based on the number of coins. The other is based on their value.
- n + d = 236
- .05n +.10d = 15.75
Solving the first for n, we get
... n = 236 - d
Substituting that into the second equation, we have
... .05(236 -d) +.10d = 15.75
... .05d = 15.75 -236·.05 . . . . . collect terms, subtract .05·236
... d = 3.95/.05 . . . . . . . . . . . . . divide by .05
... d = 79
... n = 236-79 = 157
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The solution should look familiar, as it matches the verbal description at the beginning.
