The missing number is 6 because half of 18 is 9 and half of 12 is 6
Answer: (B) - 43°
Explanation: Using the sine rule, we can say that sinA/BC = sinC/AB
sin(61)/45 = sin(C)/35
sin(C) = 35sin(61)/45
sin(C) ≈ 0.680259772....
C = arcsin(0.680259772...)
C = 42.8639459...
C ≈ 43°
Divide number of people who would buy it again by total number surveyed them multiply by 100 for the percent.
1815/3300 = 0.55
0.55 x 100 = 55%
The answer is 55%