If the line joining (3x, x+1) and (11,12) has a slope of 4 what is the value of x

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 : )

Multiply and simplify. 2x2y3z2 · 4xy4x2 how to do?

If johnny ate 5 cans of sugar, but in the kitchen they only had 3. what did johnny eat? (he found a secret stash btw.)