What is 2+2+d+3? i do not understand.

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?

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

How many grams the dog will eat in 3 days?