Select the figure that will come next in the following

If tan x + cot x  = 7, find  tan³ x + cot³ x = ?

If √y + (1/√y) = 10, then find the value of y + (1/y).

If 0.125x³ +0.216y³ = 210 and 0.25x² + 0.36y² = 10.30 then find the value of 0.5x + 0.6y.

(408 × 680)÷(20% of 680) = (250 × 260)÷ 10 + ? – 4500

 If x + 1/x = 2, find x⁷ + 1/x⁷.

Solve the system:

x + 2y = 13

3x − y = 5

What is the value of 2x + y?

If ( m+n  ) : √ (mn) = 4, m>n  , Then find the value of m : n ?

Find the value of 3/4 cot² 30° + cos² 30°-3cosec²60° + tan² 60°.