Answer:
7
Step-by-step explanation:
Simply multiply the numerators together and the denominators together:
-54(-7) = 378 (numerator)
9(6) = 54 (denominator)
378 dived by 54 is 7
-54 / 9 * -7 / 6
Multiply and divide from left to right
-6 * -7/6
42 / 6
∠D = 56°
∠D = 180° - (35° + 89°) = 56°
