Pls me on this question

15. the shaded region represents the space used for a pool in ms. perez's (1 point)
backyard. her backyard is 10 units long and 10 units wide.

[picture attached]

what is the area of the space that is not used for the pool?
16 square units
40 square units
64 square units
84 square units

Given the following statements, which is the best

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5