Answer:
no solution
Step-by-step explanation:
3^7 * 3^(-4) = 3^(7 - 4) = 3^3 = 27
2.7930 ×
1.9 × 105 × 140 = 27,930
Scientific notation: 2.7930 ×
3x-y=-2
9x-5x-x-3y+2y=-2