Concept:A bar over the integer part indicates a negative characteristic, e.g., 4.74628=−4+0.74628.Explanation:Write each number as (characteristic + mantissa):4.74628=−4+0.746282.42367=2+0.42367Add the mantissas: 0.74628+0.42367=1.16995Since the sum is ≥1, carry 1 to the characteristic sum and keep the fractional part 0.16995.Add the characteristics: −4+2=−2, then add the carry: −2+1=−1.Thus the result is −1+0.16995=1.16995.Answer:B. 1.16995