8)
in 2007, the population of north america was approximately 5.15 x 108 people and the population of south america was approximately 3.04 x 108 people. what is the combined population of north and south america for this year?
a) 8.19 x 1016 people
eliminate
b) 8.19 x 109 people
c) 8.19 x 108 people
d) 8.19 x 1064 people

You can add both units together: Namely you can add 5.15 to 3.04 = which equals to 8.19 and the average of 108 + 180 = 360/2
which means its an averige of 180.
so the correct anwser is C) 8.19 x 108 people

Abit confused about what you mean, but i think you might be referring to slope intercept form: y = mx + bin that case b, or the y intercept is already given.(0,-1)find the slope by using the formulay2 - y1/x2 - x1the final slope will be 4/2, equivalent to 2.now your equation should look like thisy = 4/2x -1sorry if this didn’t you out!