A principal orders t-shirts and wants to check some of them to make sure they were printed properly, he randomly selects 7 of the 10 boxes and checks 20 in one box and 40 in others. What type of sample is this? (It's not random sampling btw)

Cluster random sample i believe so

Step-by-step explanation:

step-by-step explanation:

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,