The lengths of the two sides of a triangle are given. Find the lengths that the third side must be greater than and less than. a. 7,2
b. 12, 21

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 : )

The anwser cause i do not understand just plez

Prove that 16^4-2^13-4^5 is divisible by 11.