self Exam Numerical Ability Trigonometry

SOLVE:COS( X) +COS (Y)+COS(Z)= 1.5.

COS( 5X) +COS (5Y)+COS(5Z)= 0.

COS( 7X) +COS (7Y)+COS(7Z)= 0.

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self Other Question

The maximum value of M of 3^x + 5^x - 9^x + 15^x -25^x as varies real over,satisfy
a) 3 < M < 5
b) 0 < M < 2
c) 9 < M < 25
d) 5 < M < 9 7M-20=2M,THEN M+7 IS EQUAL TO?