Ineed fast as possible this is due tomorrow i don't know what to do i'm dumb at math give me answers

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

Find the domain and range of the following function f(x) = 51x - 21+ 4

700 miles the train takes 5 hours to a travel the distance at what unit rate is the train traveling?