Answer:
120 students don't have social media accounts
Step-by-step explanation:
Whether the sample is representative:
Estimate: 
Hope this helps
Step-by-step explanation:
Area of the original rectangle=7×9 m²
=63m²
Let triangle removed be named as ∆ABC right angle at B, AB=(9-6)m = 3m
BC=(7-2)m =5m
area of ∆ABC= 1/2 ×3×5=7.5m²
area of the shaded region = (63-7.5)m²
= 55.5m²
Step-by-step explanation:
coordinate point of B(2,5)
and coordinate point ofC(3,1)
Distance of BC




For this case we have by definition, that the total surface area of a regular pyramid with a square base is given by:

Where:
p: It is the perimeter of the base
S: It's the inclination
It is the area of the base
Substituting:

ANswer:
Option B