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when you're doing a problem like that use this trick. let's say you have 3 to the -7 power minus 3 to the 4 power. -7 - 4 can also be shown as -7 + -4. i switched the minus sign to a plus sign and because i did that, i had to switch the positive 4 to a negative 4. so i got 3 to the -7 power plus 3 to the -4 power.
They equal a minus and two +'s or two -'s equal a + :)
Flip the fraction top-to-bottom, and delete the minus sign from the exponent.
Depends what you mean by plus. If you mean minus, then you should have said so. If not, then good.
The exponent of 10 tells you how many places to move the decimal point to the left if it is minus or to the right if it is plus.