The diagram shows a shaded ring formed by cutting a smaller circle out of a larger circle.
The radius of the smaller circle is 6 cm.
The diameter of the larger circle is 15 cm.
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Find the area of the shaded ring.

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

Item 1 solve for s. s+24=90 −114 −66 66 114