Find the measure of angle 1

A. 90
B. 110
C. 180

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Which one is the correct answer, and why?