Solve the system of equations by finding the reduced row-echelon form of the augmented matrix for the system of equations. x + y - z = -2
2x - y + 3z = 9
x - 4y - 2z = 1

Use the multiplier method to incrases £258 by 43%

What number should be added to both sides of the equation to complete this square? x^2-10x=7

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?