could you check my answer for me? is 7.4* 10^-4 seconds converted to ms which the answer is 7.4*10^-7

do you want to convert seconds to minutes?

you have to divide by 60  so your answer would not be correct.  

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OH

is it seconds to milliseconds

there are 1000 millisecs in a sec 

there is going to be a lot more milliseconds than seconds (because the unit is smaller)

so you will need to multiply by 1000.    No you answer is not correct.  Your answer got smaller not bigger 

REMEMBER:

IF THE UNIT IS BIGGER THEN THERE WILL BE LESS OF THEM SO DIVIDE  

IF THE UNIT IS SMALLER THEN THERE WILL BE MORE OF THEM SO MULTIPLY