I think B (Every fifth student from each grade)
A only talks about female students, C talks about students on a sports team which would be biased since the students on the sports team probably get more exercise, and d would be ok but not the best since some last names are more common and others you would get only a very small sample size.
Step-by-step explanation:
(x +40)° = 60°
60°- 40°=20°
x = 20°
Step 1. Subtract 3/4 from both sides
x = 1/2 - 3/4
Step 2. Simplify 1/2 - 3/4 to -1/4
x = -1/4
The picture is completely black I’m not sure if that’s what you’re trying to fix but I think you didn’t uploads it correctly.
Answer:
.
Step-by-step explanation:
