Round these numbers to the nearest 100 000: a) 6 870 628

b)18 333 206

c)704 387 454

please help

When a rectangle is dilated, how do the perimeter and area of the rectangle change?

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radil and altitudes is 4: 3? 23

36x2 + 49y2 = 1,764 the foci are located at: (-√13, 0) and (√13,0) (0, -√13) and (0,√13) (-1, 0) and (1, 0)edit: the answer is (- the square root of 13, 0) and (the square root of 13, 0)