Area of circle = πr²
Area of circle = π(4÷2)² = 12.57 cm²
$42.29
Multiply $35.24 by .2 and add that to the original bill.
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:
7x+2z+16
Step-by-step explanation:
find like terms
7 9
add them
7+9=16
7x+2z+16
