tolong jawab no.1-2 beserta caranya terima Kasih...

1. Bunga = 8.000.000 x 7/100 x 6/12
= 80.000 x 7 x 1/2
= 40.000 x 7
= 280.000
Total = 8.000.000 + 280.000
= 8.280.000
2. Sudut berseberangan = 180
(4x - 5) + (2x + 7) = 180
6x + 2 = 180
6x = 180 - 2
6x = 178
x = 178 : 6
x = 29 2/3 = 29,6