If 2x + 3y = 87 and 3x – 3y = 48, what is the value of x?

The factors of  $$ x^2-2x-15 $$ are: 

If $$ {4x^2}={25}^2-{15}^2 $$, then find the value of x.

If 3x+0.04x=0.608, find x. 

Solve: 0.05 × 0.4 

If a + b = -2 and a - b = 12, find b. 

Direction: In the following questions two equations numbered I and II are given. You have to solve both the equations and give answer.
(A) x>y
(B) x≥y
(C) x˂y
(D) x≤y
(E) x=y or the relations ship cannot be established

I.x³-371 = 629
II.y³ - 543 = 788 

Direction: In the following questions two equations numbered I and II are given. You have to solve both the equations and give answer.
(A) x>y
(B) x≥y
(C) x˂y
(D) x≤y
(E) x=y or the relations ship cannot be established

 I. x²-7x + 12 = 0
II. y² - 12y + 32 = 0