Triangle QRS is dilated by a scale factor of 3 to form triangle Q'R'S'. Side R'S' measures 48. What is the measure of side RS?

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

If value of cos330° is √3/2 then find tan165°.