Find the value of x.

  √441 ÷ 21+ √400 = 1 × x

(560 ÷ 32) × (720 ÷ 48) = ?

[(√576 × √144) ÷ √1296]² = ? ÷ 3

(3/7) x 868 + 25% of 240 = (? + 65)

The value of ((0.27)²-(0.13)²) / (0.27 + 0.13) is:

2197 ^1/3 + 30% of 1800 = ?× 343 ^1/3

Simplify the following expression:

((32)⁴ - 1)/33×31× (2¹⁰+1)

(7/4×18/21)+ (51/7× 28/17) + (25/2  × 48/10) =?

2222 ÷ 22 + 992 ÷ 16 + 650 ÷ 25 = ?

Find the simplified value of the following expression:

6² + 12² × 5 - {27² + 16² - 42²}