Researchers call random radio listeners on the phone to rank five different popular songs. This research helps radio stations decide which songs to play more often. This method of gathering data is classified as
a census.
a sample survey.
an experiment.
an observational study

a sample survey

Step-by-step explanation:

We have a sample frame of people who listen to the radio, and we are conducting a survey on this sample frame.

the discriminant is 64 + 4*1*12 = 112

this is prime.

step-by-step explanation:

26 is 33.33% of 78

step-by-step explanation:

26 is what percent of 78?

26 is p% of 78

equation: y = p% * x

solving our equation for p

p% = y/x

p% = 26/78

p = 0.3333

convert decimal to percent:

p% = 0.3333 * 100 = 33.33%