Final answer:
First, multiply 3.15 by 8.436 to get 26.5726, which can be rounded to 26.573. Then, square this number to obtain 705.930129 which, when rounded to five significant figures, results in 705.93.
Step-by-step explanation:
To calculate 3.15 × 8.436 and then raise the answer to the power of 2, first multiply the two numbers. According to the calculator, the product is 26.5726.
But, for ease of calculation, let's round it to five significant figures, which results in 26.573 because the first digit to be dropped (in the tenths place) is less than 5. Then, we'll take 26.573 and raise it to the power of 2 to get the final result.
26.5732 = 705.930129. However, if we round this to five significant figures, we get 705.93.