Answer: central heating system
The name Bahamas is derived from the Lucayan name Bahama ('large upper middle island'), used by the indigenous Taíno people for the island of Grand Bahama. Tourist guides often state that the name comes from the Spanish baja mar ('shallow sea').
destroying one part of the ecosystem affects every other part of it .
To change the equation, you'd have to take the square root of both sides. When you do this, x^2 cancels out leaving you with x = sqrt(y)
If you need help on the other ones, all you have to do is solve for x by using either addition/subtraction or dividing/multiplying.