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4x + 7y = 1 1. 3x + 10y = 15  2. 1. x 3 (4x x 3) + (7y x 3) = 1 x 3                       12x + 21y = 3  3. 2. x 4  (3x x 4) + (10y x 4) = 15 x 4                         12x + 40y = 60  4. 4. - 3.  (12x -...

11-W/4 = 1+W

11-W = 4+4W      (Multiply both sides by 4) 

11 = 4+5W          (Add W to both sides) 

7 = 5W                ( Subtract 4 from both sides)

W = 7/5               (D...

Rearange the equation to make r the subject of the formula. So we divide both sides by 2(pi)

Area of a cirlce = π x r^2

The radius (r) = the diameter / 2

So, r = 60/2 = 30

Therefore, the area of the ice rink = π x 30^2 = 900π

Surds are irrational numbers that can't be represented accurately as a fraction or reccuring decimal, so they are left as a square root. For example:  √  3 . Calculate the square root of 3 using your calc...