7x^4-9x^3-4x^2+5x+6)-(2x^4+3x^3-x^2 +x-4)

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

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 : )

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