Let g be the set g = {x = a + b squareroot 2 | a, b elementof q} with operation x rightarrow y = xy, i. e., ordinary multiplication. is (g, x) a group? if not, can we change the definition of g slightly to make this work as a group?

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.

98 point question what is the record for most points in one

The edge of a cube was found to be 30 cm with a possible error in measurement of 0.4 cm. use differentials to estimate the maximum possible error, relative error, and percentage error in computing the volume of the cube and the surface area of the cube. (round your answers to four decimal places.) (a) the volume of the cube maximum possible error cm3 relative error percentage error % (b) the surface area of the cube maximum possible error cm2 relative error percentage error %