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a> The 10th layer will be 1+ (n-1)x4 = 1 + (10-1)x4 = 1+36 = 37

b> The total number of 15 layer will be

      1 + [1+(2-1)x4] + [1+(3-1)x4] + [1+(4-1)x4] + … + [1+(15-1)x4]

= 1 + [1+4] +[1+2×4] + [1+3×4] + … + [1+14×4]

= 1 x 15 + (1+2+3+4+ … +14)x4

= 15 + (15×7)x4

= 15x(1+28)

=15×29

=435

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