B) Work out 4 1/2 ÷ 3/5

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

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 : )