a) A = 2.9362 ≈ 2.94
B = 2.791 ≈ 2.79
A + B = 2.94 + 2.79 = 5.73
A - B = 2.94 - 2.79 = 0.15
b) A = 39.283 ≈ 39.28
B = 14.809 ≈ 14.8
A + B = 39.28 + 14.8 = 54.08
A - B = 39.28 - 14.8 = 24.48
a) A = 2.9362 ≈ 2.94
B = 2.791 ≈ 2.79
A + B = 2.94 + 2.79 = 5.73
A - B = 2.94 - 2.79 = 0.15
b) A = 39.283 ≈ 39.28
B = 14.809 ≈ 14.8
A + B = 39.28 + 14.8 = 54.08
A - B = 39.28 - 14.8 = 24.48