Please help me answer these! Also, please provide steps so i can learn how to do so on my own!

#2 Experimental

Step-by-step explanation:

   In an observational study, we measure or survey members of a sample without trying to affect them.

   In a controlled experiment, we assign people or things to groups and apply some treatment to one of the groups, while the other group does not receive the treatment.

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step-by-step explanation:

answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft