A sound with a single frequency is called

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

(6⁴ ÷ 12²) + (5² × 3) = ?

34 × 5 × 2 ÷ 6 + 7 × 5 + 13 = (?)× 6 – 754

What will come in the place of question mark (?) in the given expression?

34 X 11 - ? + 36 = 3 X 75 + 125

?% of 740 – 8% of 650 = 7.2

(1/3) + (2/5) + (3/4) + (11/10) = 3 – (?/12)

135÷ 15 x 19 + 14807 = ? + √3249 - √9604

√4096 + 4/5 of 780 − ? = 296

40% of 225 – 25% of 120 = 15% of ?

(23.95)² – (25.006)² + (8.0099)² – (7.07)² = ? - (14.990)²