What are the solutions of x2 -2x+2=0

Is the square root of 4 plus the square root of 16 rational?

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655

The distance of a chord from the centre of a circle is 12cm and the lenght of the chord is 10cm. find the radius of the circle