A scale drawing of a roller coaster had a scale of 1 inch to 10 feet. if the height of the roller coasters first him is 12 inches on the scale drawing, what is the actual hight of the first hill

Can someone me out here number 4 plz

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.

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 : )