How to find the value of x of a triangle with all three sides having numbers.

What is (28 + 7 + 6 + 3) x 1/2 show your work

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?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)