Final answer:
The value of (0.23)3 - (0.21)3 is 0.002906. The value of (0.23)3 + 0.23 * 0.21 + (0.21) is 0.270467.
Step-by-step explanation:
To find the value of (0.23)3 - (0.21)3, we first calculate the individual cubes. (0.23)3 = 0.012167, and (0.21)3 = 0.009261. Then, we subtract the second value from the first, which gives us 0.012167 - 0.009261 = 0.002906.
To find the value of (0.23)3 + 0.23 * 0.21 + (0.21), we use the previously calculated cube value of (0.23)3 = 0.012167. Substituting the values, we get 0.012167 + 0.23 * 0.21 + 0.21 = 0.012167 + 0.0483 + 0.21 = 0.270467.