What should come in place of the question mark (?) in

If 3x + 5y + 7z = 49 and 9x + 8y + 21z = 126, then what is the value of y?

If (a + b)/c = 6/5 and (b + c)/a = 9/2, then what is the value of (a + c)/b?

Which one of the following is the equation for Velocity Time relation?

If (a² − b²)sin θ + 2ab cos θ = a² + b², then tan θ =

If x + y = 7 and xy = 10, then the value of (1/x³ + 1/x³) is :

Quantity I – ³

Quantity II – 25⁴

If > 0 and < 0

If x² + y² + 2x + 1 = 0, therefore the value of x³¹ + y³⁵ is

If a³ + 3a² + 9a = 1, then what is the value of a³ + (3/a)?

If 0 ≤ θ ≤ 90°, and sec¹⁰⁷ θ + cos¹⁰⁷ θ = 2, then. (secθ + cosθ) is equal to: