exam Maths Puzzle Numerical Ability

how do i do this?

Write the answer in scientific notation

2.0010(to the 5th power)5.00*10(to the -3rd power).

explain it please.
:)

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exam Other Question

3/7x +2 =4/7x-5
I have tried this over and over again - i keep coming up with -49, but the answer should be 7. I cannot figure it out.
I learned that you should multiply everything by the LCD to make everything a whole number first.
Graph x + y = -2.

I am not sure or remember how to do this. Can someone help me with this. Thanks