Tranlation

Tranlate of the following statement into an equations: The diameter (d) of a circle is twice its radius ( r ) .

Tranlate of the following statement into an equations: Amount (A) is equal to the sum of Principal (P) and Interest (I).

Tranlate of the following statement into an equations: The perimeter (p) of an equilateral triangle is three times of its side (a).

Tranlate of the following statement into an equations: The selling price (s) of an item is equal to the sum of the cost price ( c ) of an item and the profit (p) earned.