Question

Add 7.3 x 10^7 + 1.8 x 10^7. Which is the correct sum.

answers:

9.1 x 10^14

8.1 x 10^7

9.1 x 10^7

9.1 + 10^7

Answer 1

are you sure.

Answer 2

To add the two numbers \( 7.3 \times 10^7 \) and \( 1.8 \times 10^7 \), you can combine them since they are in the same power of ten:

\[
7.3 \times 10^7 + 1.8 \times 10^7 = (7.3 + 1.8) \times 10^7 = 9.1 \times 10^7
\]

So, the correct sum is \( 9.1 \times 10^7 \).

The correct answer from your options is:

**9.1 x 10^7**.

Answer 3

Yes, I'm sure.

When you add \( 7.3 \times 10^7 \) and \( 1.8 \times 10^7 \), since both terms share the same exponent of \( 10^7 \), you can simply add the coefficients (the numbers in front):

\[
7.3 + 1.8 = 9.1
\]

Thus, you get:

\[
(7.3 + 1.8) \times 10^7 = 9.1 \times 10^7
\]

The calculation is correct, and the answer is \( 9.1 \times 10^7 \).