Which accounting principle requires that revenue is recognized when a sale is made or a service is provided?

[(4√ (7) +√ (7))× (7√ (7) + 6√ (7))] - 87 = ?

690 ÷ (75% of 460) = ? ÷ (50% of 160)

12% of 10% of 15% of 5000 + (12 x 15) = ?

((1024)^n/5  × (4²ⁿ⁺¹ ))/(16ⁿ  × 4^n-1  ) = ?

(√784 ×20+ √4225 ×14)/(√1764 ×5) = ?

95% of 830 - ? % of 2770 = 650

If (i) P is taller than Q, (ii) R is shorter than P, (iii) S is taller than T but shorter than Q, then who among them is the tallest?

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

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

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