Respuesta :

55. B

56. F

57. B

58. 2 x 7 = 14 for the steps and top, 2 x 3 = 6 for the back, 2 x 4 = 8 for the bottom, ( ( 3 x 2 ) + 3 ) x 2 = 18 for the two sides.

Altogether, the surface area is:

= 14 + 6 + 8 + 18 = 46 units²

59. I

60. D