Question

Find the sum of (6.9 �� 10���) and (5.9 �� 10���). Write the final answer in scientific notation.

1) 1.28 �� 10�����
2) 12.8 �� 10����
3) 7.49 �� 10���
4) 7.49 �� 10���

Answer 1

To sum 6.9 * 10^6 and 5.9 * 10^5, convert 5.9 * 10^5 to 0.59 * 10^6, then add the coefficients. The sum is 7.49 * 10^6 in scientific notation, corresponding to option (d).

Step-by-step explanation:

To find the sum of 6.9 * 10^6 and 5.9 * 10^5 and express the answer in scientific notation, we need to first ensure that the exponents of 10 are the same. We can write 5.9 * 10^5 as 0.59 * 10^6 to match the exponent of the first number. Now we can add the two numbers:

• 6.9 * 10^6
• 0.59 * 10^6

Adding the coefficients gives us 6.9 + 0.59 = 7.49. Therefore, the sum is 7.49 * 10^6, which is option (d).

The Incomplete Question:

Find the sum of (6.9* 10^6) and (5.9* 10^5). Write the final answer in scientific notation.

a) 1.28* 10^(10)

b) 12.8* 10^(11)

c) 7.49* 10^5

d) 7.49* 10^6