About 3.2×10^8 people live in the United States. About 3.9×10^7 people live in Canada. And about 1.1×10^8 people who live in Mexico. About how many people live in all three countries altogether?

David is spreading mulch on a triangular area of his flower bed. the coordinates of the vertices of the area are (1, 3), (9, 3), and (4, 6). what is the area of the triangle if each square has an area of 3 square feet?

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth

Find the root(s) of f (x) = (x- 6)2(x + 2)2.