-3√7 (multiplication of 3 and √7 = 3√7) -√7 = 21-0.2 (√10)^2 (exponentiation should be done first, √10)^2 = 10) + 4.3-0.2 * 10 + 4.3 = -2 + 4.3 = 2.3
Therefore, the final answer is 21 + 2.3 = 23.3.
-3√7 (multiplication of 3 and √7 = 3√7) -√7 = 21
-0.2 (√10)^2 (exponentiation should be done first, √10)^2 = 10) + 4.3
-0.2 * 10 + 4.3 = -2 + 4.3 = 2.3
Therefore, the final answer is 21 + 2.3 = 23.3.