Fixing two of the bits leaves four remaining positions, each with two possibilities (0 or 1), so there are

possible strings.
Neither equation is correct. the correct equation would be 44 - 7 = x
2 5/2 - 2 3/2
9 / 2 - 7 / 2
= 1
(2.5×10⁻⁸)(9×10⁻¹⁰) = 2.5×9×10⁻⁸⁻¹⁰ = 22.5×10⁻¹⁸
= 2.25×10⁻¹⁷
_____
The rules of exponents apply.
... 10^a × 10^b = 10^(a+b)
... 22.5 = 2.25 × 10¹
Answer: 1.616 of adding and subtracting will be 1.476
Step-by-step explanation: