Is |a + b| = |a| + |b| true for all rational numbers a and b?

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.