18. Why would researchers choose a double-blind study? O To prevent anyone from treating subjects in a way that changes their response

O To prevent researchers from knowing the results of a study after it is over

O To prevent subjects from choosing placebo

O Researchers do not use double-blind studies anymore

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Abucket of paint has spilled on a tile floor. the paint flow can be expressed with the function p(t) = 6(t), where t represents time in minutes and p represents how far the paint is spreading. the flowing paint is creating a circular pattern on the tile. the area of the pattern can be expressed as a(p) = 3.14(p)^2 part a: find the area of the circle of spilled paint as a function of time, or a[p(t)]. show your work. part b: how large is the area of spilled paint after 8 minutes? you may use 3.14 to approximate pi in this problem.

30 ! the graph shows the number of siblings different students have. select from the drop-down menus to correctly complete the statement.