Direction: what should come in place at question mark(?).

$$ {\sqrt{4489}+(71)^{2}-(?)^{2}=2707}$$

Direction: what should come in place at question mark(?).

45% of 224×?% of 120=8104.32

The value of $$ {5-[2+3(2-2× 2 +5)-5]÷5}\over {4×4÷4}of(4+4÷4 of 4)$$ is:

What is the value of $${0.74×1.23×0.13\over (0.37)^{3}+(0.41)^{3}-8(0.39)^{3}}$$ ?

The value of $$ {\sqrt{0.6912}+{\sqrt{0.5292}}\over {\sqrt{0.6912}-{\sqrt{0.5292}}}}$$ is:

What is the value of x $$ {0.081\over x}={0.09\over10}$$ ?

5.52 – 2.3² + 0.8³ × 0.12 ÷ 0.4⁴ – 3.14 =?

If $$ {0.7\over 1-6c}=-0.2$$ then what is the value of c.