What is x? -7x-3x-17=8x+19 pls me

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

How to write four times a number,minus 6,is equal to theee times the number+8 as an equqtion

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )