Answer:
The product of 
and 
is 
. The reciprocal is 
.
Step-by-step explanation:
We have to find the product of and before we find the reciprocal.
Before we do this though, we need to review a few words and their definitions.
First, the reciprocal of a fraction is when the numerator becomes denominator and the denominator becomes numerator.
Now we're ready to solve 
:
Step 1: Use this rule: 
.
Step 2: Simplify 7 × - 3 to - 21.
Step 3: Simplify 6 × 28 to 168.
Step 4: Move the negative sign to the left.
Step 5: Simplify 
to 
.
Now that we've found the product, we now must find the reciprocal.
Now using what we know and the process to find the reciprocal.
We can use that knowledge to find it:
It the wiper blade (and arm) made a full rotation, 2 circles would be formed.
One small circle with radius
b, and a larger circle with radius
a+b.
The areas of these 2 circles are respectively:
and
120° is 1/3 of a complete angle 360° which form a circle, so the areas formed by the arm of length b, and the arm + the wiper blade (a+b) are:
and
in squared respectively.
the actual wiped area is
(in squared)
Area of the window is 54*24= 1296 (in squared)
thus, the ratio of the wiped area to the whole area of the window is 351.7/1296=0.271
Converted to percentages, this is 27.1%
Answer: 27.1%
Nice fact I guess
I don’t know
Okay so the formula for speed is speed = distance divided by time so 120 /4 is 30 for the first bar
