Answer:
2.81x 10⁹
Explanation:
we are required to carry out the operation using the addition and multiplication.
In simple terms you can add the number (9.1 + 1.9) on ther own and also use indices to add (10⁸ + 10⁹)
but since the powers of 10 are not equal we need to ensure we make them equal. To make them equal it means we need to multiply 1.9 X 10 so as to reduce its power also to 8
we now get
(9.1 + 19.0) = 28.1
we now multiply it by 10⁸
28.1 × 10⁸
= 2.81x 10⁹