Set of equations that can be used to calculate rate for each plumber:
2A+8B+8C = 1,400 --- (1)
4A+7B+10C = 1,660 --- (2)
3A+9B+9C = 1,660 --- (3)
------------------------------------
2*(1) - (2)
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4A+16B+16C = 2,800
4A+7B+10C = 1,660 -
------------------------------------
9B+6C = 1,140 --- (4)
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3(2) -4(3)
-----------------------------------
12A+21B+30C = 4,980
12A+36B+36C = 6,600 -
-----------------------------------
-15B-6C = -1,620 --- (5)
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(4) + (5)
------------------------------------
9B+6C = 1140
-15B-6C = -1620 +
-------------------------------------
-6B = -480 => 6B = 480 => B = 480/6 = 80
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Using (4), 9(80)+6C = 1140
720+6C = 1140 => 6C = 1140-720 = 420 => C = 420/6 = 70
------------------------------------------------------------------------------
Using (1), 2A+8(80)+8(70) = 1400
2A+640+560 =1400 => 2A = 1400-640-560 = 200 => A = 200/2 = 100
----------------------------------------------------------------------------------------------
The rates are:
A = $100
B = $80
C = $70
--------------------------------
On Thursday, number of calls: A = 4 hrs, B = 6 hrs, C = 3 hrs
Money earned = 4*100+6*80+3*70 = $1,090
Answer + Step-by-step explanation:
Settings can affect the character in a number of ways.
For example, it can cause conflict and influence the character's
actions. In the setting of a war, it will obviously cause conflict
for a character or change the character's attitude towards another
character whom they probably knew well. The setting can affect the mood
and tone of the scene, resulting in many actions the reader did not think was
going to happen before.
<u><em>Hope this helps, feel free to message me in the comments</em></u>
<u><em>if my answer is wrong ;)</em></u>
<u><em></em></u>
- genius423
Complete Question
Problem 7.43
A chemical plant superintendent orders a process readjustment (namely shutdown and setting change) whenever the pH of the final product falls below 6.92 or above 7.08. The sample pH is normally distributed with unknown mu and standard deviation 0.08. Determine the probability:
(a)
of readjusting (that is, the probability that the measurement is not in the acceptable region) when the process is operating as intended and 
= 7.0 probability
(b)
of readjusting (that is, the probability that the measurement is not in the acceptable region) when the process is slightly off target, namely the mean pH is = 7.02
Answer:
a
The value is 
b
The value is 
Step-by-step explanation:
From the question we are told that
The mean is 
The standard deviation is 
Considering question a
Generally the probability of readjusting when the process is operating as intended and mu 7.0 is mathematically represented as
=> 
Generally
So
=> 
=> 
From the z table the probability of (Z < -1.25) and (Z > 1 ) is
and
So
=> 
=>
Considering question b
Generally the probability of readjusting when the process is operating as intended and mu 7.02 is mathematically represented as
=> 
Generally
So
=> 
=> 
From the z table the probability of (Z < -1.5) and (Z > 0.75 ) is
and
So
=> 
=>
Answer:
sorry i don't know the answer
Step-by-step explanation:
Positive numbers is the last one
