Calculate total surface area of a cone with a radius of 6 and a slanted height of 13

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Can someone me with this graph problem by the way i need to know the answers by today since this assignment is due ! !

Astudent found the solution below for the given inequality. |x-9|< -4 x-9> 4 and x-9< -4 x> 13 and x< 5 which of the following explains whether the student is correct? -the student is completely correct because the student correctly wrote and solved the compound inequality. -the student is partially correct because only one part of the compound inequality is written correctly. -the student is partially correct because the student should have written the statements using “or” instead of “and.” -the student is completely incorrect because there is no solution to this inequality.