Aculture of 1.75×1018 bacteria is in petri dish a. a culture of 6.25×1015 bacteria is in petri dish b. how many times greater is the number of bacteria in petri dish a than petri dish b? enter your answer, in standard notation, in the box.

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)