X - 2y = - 6 solving by substitution

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25

Which triangles could not be similar to triangle abc ? triangle a b c where angle b is a right angle. side a b is 15 cm. side b c is 8 cm. side a c is 17 cm. select each correct answer. right triangle g h i with right angle at h. g h is 77 centimeters. g i is 85 centimeters. h i is 36 centimeters. right triangle j k l with right angle at k. j k is 60 centimeters. j l is 68 centimeters. k l is 32 centimeters. right triangle m n o with right angle at n. m n is 35 centimeters. m o is 37 centimeters. n o is 12 centimeters. right triangle d e f with right angle at e. d e is 22.5 centimeters. d f is 25.5 centimeters. e f is 12 centimeters.

The larger triangle is the image of the smaller triangle after a dilation. the center of the dilation is (−2,−2). what is the scale factor used to create the dilation? enter your answer in the box.