4. calculate the area of the rhombus shown below
kn = 12.3 and jl = 30.6.

Solve the system of equations. y= 2x y= x^2 - 15

What is the solution of sqrt x+2-15=-3

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum