Lakpa buys 20 items for 6000rupees .he sells them at 390rupees each. calculate his total profit on the deal.

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?