Solve the system linear equations, using Gaussian Elimination x + y + z = 3
x - 8y + 5z = - 88
9y + 8z = 7

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Two friends are reading books. jimmy reads a book with 21,356 words. his friend bob reads a book with one-and-a-half times as many words. which expression represents the number of words bob reads?

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?