Identify which type of sampling is used: random, systematic, convenience, stratified, or cluster. to determine customer opinion of their check dash in servicecheck-in service, american airlinesamerican airlines randomly selects 8080 flightsflights during a certain week and surveys all passengers on the flightspassengers on the flights.

Convenience Sampling

Step-by-step explanation:

Since here survey is done only on a certain week and all passengers of certain flight are used to a survey which can be done for convenience hence here convenience sampling is used.

In convenience sampling observer is doing sampling by seeing his/ her convenience.

If American Airlines randomly select flight then it will be random Sampling.

If there are different types of flight and different types of customers then only it can be stratified or cluster sampling.

If the choice of the passenger is done by any criteria then it will be systematic sampling.

Hence, here convenience sampling is used.

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions