To determine which of the options results in the answer of 1, we need to evaluate each expression:
A. \( 5^0 + 9^0 \)
- \( 5^0 = 1 \) and \( 9^0 = 1 \)
- Therefore, \( 5^0 + 9^0 = 1 + 1 = 2 \)
B. \( 3 (8^0) \)
- \( 8^0 = 1 \)
- Therefore, \( 3 (8^0) = 3 \times 1 = 3 \)
C. \( 13 - (7.42)^0 \)
- \( (7.42)^0 = 1 \)
- Therefore, \( 13 - (7.42)^0 = 13 - 1 = 12 \)
D. \( (-2.97)^0 \)
- \( (-2.97)^0 = 1 \)
From evaluating these options, only option D results in 1.
So the answer is: D. (-2.97)^0