Five times the sum of a number and 7 is 3 more than the double of a number. Find the number. Show all work! Please anyone answer, I will mark brainliest!!!

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 : )

Add the two expressions 4.6 x -3 + -5.3 x + 9

Lm is the midsegment of trapezoid abcd. if ab=46 and dc=125, what is lm?