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

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

How many bananas are in a fruit bowl that has 200 total apples and bananas if there are 31 bananas for every 93 apples

Can someone check if i did this correct. it’s number 4 if you’re wondering.