Answer:
(A) 509.78
We need to move the decimal point after the first non-zero digit
So,
=> 5.0978 × 10² (Since the decimal point is moved two places to the left)
(B) 0.0289
Again after the first non-zero digit:
So, it becomes:
=> 2.89 × 10⁻² (Since the decimal point is moved 2 places to the right so it will be negative also)
Answer:

Step-by-step explanation:
Answer: 115 - (-30) = 115 + 30 = 145 degrees change
Step-by-step explanation:
Answer: 81
Step-by-step explanation: Because, (-3)^4=-3*-3*-3*-3=-(-81)=81
2^2+b^2=12^2
4+b^2=144
144-4=140
√140 = √b
11.83 = b