2 + (-19) = ? What is the answer.
2 answers:
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Answer:
Therefore the work done is 640 ft pound.
Step-by-step explanation:
Given that, a heavy rope 40 ft long, weighs 0.8 lb/ft.
Force = weight.
Let we pull x ft. Then the remain rope = (40-x)ft.
(40-x) ft it is variable.
The weight of (40-x) ft is =(40-x)0.8 lb
∴ Force =(40-x)0.8 lb
Work done = Force × displacement
= (40-x)0.8 Δx [ displacement = Δx]
Therefore ΔW =(40-x)0.8 Δx
Since total rope is pulling up on the top of the building. Total displacement = 40 ft.
Total work done
=640 ft pound.
Therefore the work done is 640 ft pound.
Answer:
So the discount is 33% and we are paying 67% of the value. The reason is given by the relative change:
Step-by-step explanation:
First we have a first discount of 40% so then using this condition and assuming that represent the initial price, the price after the first discount
is given by:
That means 60% of the original value.
Now we have another discount of 45% for the 60% reamining after a 2 discount so let's represent the price after the second disccount we can can express this price in terms of
or
liek this:
So the discount is 33% and we are paying 67% of the value. The reason is given by the relative change: