Evaluate: 2x - y for x = 3 and y = - 5

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

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?

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)