1) 30(-0.1)^3 + 7(-0.1)^2 - 3.9 = -0.03 + 0.07 - 3.9 = -3.86
2) -0.6(-9)^4 + 1.9(-9)^2 - 4 = -0.66561 + 1.981 - 4 = -3936.6 + 153.9 - 4 = -3786.7
3) 3^8 * 3^5 ÷ 3^9 = 3^(8+5-9) = 3^4 = 81
1) 30(-0.1)^3 + 7(-0.1)^2 - 3.9 = -0.03 + 0.07 - 3.9 = -3.86
2) -0.6(-9)^4 + 1.9(-9)^2 - 4 = -0.66561 + 1.981 - 4 = -3936.6 + 153.9 - 4 = -3786.7
3) 3^8 * 3^5 ÷ 3^9 = 3^(8+5-9) = 3^4 = 81