Question

0.0072×81.3 23140

Answer 1

Online, “*” is used to indicate multiplication to avoid confusion with “x” as an unknown.

It would help if you would proofread your work before you post it.

With the space, I'm not sure if something is missing.

.0072 = 72*10^-4

Multiply long number (whatever it is) by 72 then incorporate the 10^-4.

I hope this helps.

Answer 2

7.2 * 10^-3 instead of 72 * 10^-4

The coefficient in front of the power of x should be a number between 1 and 9 inclusive for standard scientific notation.

I assume the .0072 was used as an example, since it is by no means
the answer to the given problem. I agree with PsyDAG about the space in the last multiplier, it is confusing.

I got 0.58552... or appr. 5.86 * 10^-1
as an actual answer