Find the exact value of the following question:

$$ \sqrt {123×8+2389-1164}=? $$

Find the exact value of the following question:

$$ (13+2\sqrt{5})^2=?\sqrt{5}+189 $$

Find the exact value of the following question:

$$ 8\sqrt{?}÷14×3+9=21$$

Find the exact value of the following question:

$$ 1280÷{2^3} + 1220÷{2^2}-182=?$$

Find the exact value of the following question:

$$ 3{1\over2} × 3 {1\over 7}+ 5{3\over4}÷{46\over3}=?$$

(3x-7)³+(3x-8)³+(3x+6)³=3(3x-7)(3x-8)(3x+6)
Find the value of x ?

In the following question two equations numbered I and II are given. You have to solve both the equations and ____
I.$$ {15\over \sqrt {x}}-{2\over \sqrt {x}}=6\sqrt {x}$$
II.$$ {\sqrt {y}\over 4}-{7\sqrt {y}\over \sqrt {12}}={1\over \sqrt {y}}$$
Give answer
(A) x>y
(B) x≥y
(C) x<y
(D) x≤y
(E) x=y or the relationship cannot be established

Direction: In the following questions two equations numbered I and II are given. You have to solve both the equations and Give answer

Give answer (A) If x > y
Give answer (B) if x ≥ y
Give answer (C) if x<y
Give answer (D) If x ≤ y
Give answer (E) if x=y or the relationship cannot be established.

 I. x² – 7x+ 12=0
II. y²-12y+32 =0