If the length of is 4 units, the area of ∆adc is square units.

the area of ∆ADC is  6

Step-by-step explanation:Solution - As the triangle ADC is the reflection of the triangle ABC, so the area of both the triangles will be same.

Here BE is the height and AC is the base of ABC.

Area of triangle ABC = ×Base×Height

= ×3×4

= 6 sq.units

So the area of triangle ADC = 6 sq.units

E). taking a poll in the lunch room (where all students currently have to eat lunch) to determine the number of students who want to be able to leave campus during lunch

It seems that when gathering a sample, it should nearly be able to grasp the entire population. Sample represents the population being studied. In this case, the poll can subject all the participants since they all are utilizing the area. In addition, this lets them have an equal chance of participating with a high degree of representing the population.