evaluate express your answer in scientific notation

Question

7.78 x 10^-7 - 2.48 x 10^-6

Answer 1

To subtract these numbers in scientific notation, we need to make sure that the exponents are the same.

7.78 x 10^-7 = 0.000000778
2.48 x 10^-6 = 0.00000248

Now we can subtract:
0.00000248 - 0.000000778 = 0.000001702

Expressing the result in scientific notation:
0.000001702 = 1.702 x 10^-6

Therefore, 7.78 x 10^-7 - 2.48 x 10^-6 = 1.702 x 10^-6.

Answer 2

ypu didn't keep track of the subtraction correctly.

7.78 x 10^-7 - 2.48 x 10^-6
= 0.778x10^-6 - 2.48x10^-6
= -1.702x10^-6

Answer 3

Apologies for the mistake in my calculation. Thank you for pointing it out.

The correct evaluation is:
7.78 x 10^-7 - 2.48 x 10^-6 = -1.702 x 10^-6

Thank you for the correction.