Question

0.000007914 converted to standard notation

Answer 1

I mean no!
the exponent is negative as the number is < 0

Answer 2

7.914 x 10^-6

Answer 3

The standard form of that number is \[79410\times10^{-10}\]
Just move the number farthest to the left that isn't zero, all the way in front of the decimal point. Count how many times you had to move it, since it was moved ten times, the power of ten is negative ten.