What is the radius and diameter of the following circle? 7.5cm

The difference of 2 numbers is 21 and the quotient of the equation is 4 then what are the two numbers?

Simplify 5 square root of 7 end root plus 12 square root of 6 end root minus 10 square root of 7 end root minus 5 square root of 6 . (1 point) 5 square root of 14 end root minus 7 square root of 12 5 square root of 7 end root minus 7 square root of 6 7 square root of 12 end root minus 5 square root of 14 7 square root of 6 end root minus 5 square root of 7

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)