X+ y is rational, must x and y each be rational

Solve the equation using the given values: x= -2.5; y= -7.51. 2xy + 2x²

Which graph represents an even function?

Mexico city, mexico, is the world's second largest metropolis and is also one of its fastest-growing cities with a projected growth rate of 3.2% per year. its population in 1991 was 20,899,000 people. use the formula p = 20.899e0.032t to predict its population p in millions with t equal to the number of years after 1991. what is the predicted population to the nearest thousand of mexico city for the year 2010?