I need help with geometry

Which value would be a solution for x in the inequality 47-4x< 7

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Marcus and cody both leave the park at the same time, but in opposite directions. if cody travels 6 mph faster than marcus and after 4 hours they are 64 miles apart, how fast is each traveling? solve using rare times time = distance.