Answer:
x=3 , x=-3
Step-by-step explanation:
Add 9 on both sides
To remove base 'e' we take ln on both sides
Both sides have ln , so we make the terms equal
Take square root on both sides
x=3 , x=-3
Answer: 7 students do not ride the bus
Step-by-step explanation:
15 + 20 = 35
20% = 0.2
35 x 0.2 = 7
Answer:
in 36 years
Step-by-step explanation:
in 36 years, Max will be 54 YEARS OLD and Leo will be 18 YEARS OLD.
54÷18= 3
this means that when max is 54, he will be 3 times older than leo
it can also be when Leo is 6 and Max is 18 because:
18÷6=3 means max is already 3 times older than leo
Answer:
This sampling technique is called cluster
Step-by-step explanation:
Samples may be classified as:
Convenient: Sample drawn from a conveniently available pool.
Random: Basically, put all the options into a hat and drawn some of them.
Systematic: Every kth element is taken. For example, you want to survey something on the street, you interview every 5th person, for example.
Cluster: Divides population into groups, called clusters, and each element in the cluster is surveyed.
Stratified: Also divides the population into groups. However, then only some elements of the group are surveyed.
In this question:
The population is divided into groups(by stores), and all elements of the groups(all customers at the stores are sampled), which is the characteristic of a cluster sampling.
