Question

Find the sum of (2. 8 × 10−9) and (9. 1 × 10−10). Write the final answer in scientific notation

Answer 1

To find the sum of (2.8 × 10^(-9)) and (9.1 × 10^(-10)), first, we need to ensure that both numbers have the same exponent in their scientific notation representation. To do that, we can convert (9.1 × 10^(-10)) to the same exponent as (2.8 × 10^(-9)).

(9.1 × 10^(-10)) = (0.91 × 10^(-9)) (move the decimal one place to the right)

Now, the sum is:

(2.8 × 10^(-9)) + (0.91 × 10^(-9)) = (2.8 + 0.91) × 10^(-9) = 3.71 × 10^(-9)

The final answer in scientific notation is 3.71 × 10^(-9).

Answer 2

1.9×10^1 And 8.1×10^1

(2.8×10-9)

first 2.8×10=28

then 28-9=19

ANSWER: 19

in scientific notation is: 1.9×10^1

(9.1×10-10)

first 9.1×10=91

then 91-10=81

ANSWER:81

In scientific notation is 8.1×10^1