Amanufacturer of metal washers needs to determine the cross-sectional area of each washer. if the outer radius of the washer is r and the radius of the hole is r, express the area of the washer as a polynomial. factor this polynomial completely.

The formula for area of any circle is :πr2.  

To find the area of the washer, subtract the area of the hole from the area of the outer circle:

A = πR2 - πr2

A = π(R2 - r2)

Now factor completely:

A = π(R + r)(R - r)

answer:

step-by-step explanation:

here, the total dishes = 10

dishes having meat = 3 ( chicken, meatloaf and hamburger )

thus, the probability of having meat on the chosen dishes = number of dishes having meat / total dishes

=

therefore, the probability of not having meat = 1- the probability of having meat on the chosen dishes

=

=

=

⇒ option b is correct.