Answer:
a) cluster sampling
Step-by-step explanation:
In cluster sampling method, each member of a population is assigned to one and only one group.This means clusters are formed through probability method usually a simple random sampling.The participants in the clusters are the only one to be surveyed.
In this example, simple random sampling is used to identify 12 home rooms(cluster) where a group of 20 students (participants) in each room is given the survey.
Answer:
TWX by AAS
Step-by-step explanation:
Answer:
Each triangle has angles and all of those angles add up to 180 degrees total. since both of those angles at the bottom are equal then their angles would each be 70.
Separating the integral, we get the integral of 1/x minus the integral of 4/(x^2+1). From memory, I know that the integral of 1/x is ln(x). Next, I can separate the 4 from 4/(x^2+1), and I know from memory that the integral of 1/(x^2+1) is arctan(x). Therefore, your answer is ln(x)+C-4arctan(x)+C=ln(x)+4arctanx+C (Since C simply represents any number, we don't need to make it 2C. In addition, the C after 4arctan(x) and ln(x) could be different, so C-C would be some constant C too in this case)
