Instructions: the polygon in each pair are similar. find the missing side length.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z