Answer: 7.8 days
<u>Step-by-step explanation:</u>
Painter can get the job done in 15 days so gets
of the job done in 1 day.
Coworker can get the job done in 10 days so gets
of the job done in 1 day.
Together, they get
of the job done in 1 day.
Painter worked for 3 days so completed
of the job.
That leaves a remaining of
of the job to be completed.
Let x represent the number of days it will take them to work together.
Painter + Coworker = Together

Multiply by 30 to eliminate the denominator:

Simplify and solve for x:
2x + 3x = 24
5x = 24

x = 4.8
Remember that Painter worked 3 days alone in addition to the 4.8 days they worked together.
So the total time to paint the building is 3 + 4.8 = 7.8
Answer:
The top left is correct. ;D
Answer:
communitive property of addition
Step-by-step explanation:
The community property of addition states: a+b=b+a
This basically means that when you add two numbers, the order of when you add them does not occur.
Answer:
f'(x)= 
Step-by-step explanation:
As khown the derivative of arcsin(x) is;
f'(x)= 
Answer:
We don't have the ability to tell
Step-by-step explanation:
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