The product is equal zero if one of the factors is equal zero.Therefore:
A.
because the total distance of every triangle 180. Add the two other angles so 42+ 57 =99. Then you have to subtract those two combined angles to find the missing one from the total distance, which is 180. 180-99=81. the answer is A. 81
Answer:
In x + 2 = 7, x is a variable,
Step-by-step explanation: