A sociologist wants to know the opinions of employed adult women about government funding for day care. She obtains a list of the 520 members of a local business and professional women's club and mails a questionnaire to 100 of these women selected at random. Only 48 questionnaires are returned

stratified random sampling

Step-by-step explanation:

The sampling design that is involved in the above study is the stratified random sampling design. In the study the population of sample is divided into two kinds of members. The two kinds of members are the local business members and the professional club members in a local area. These are called the stratums. The sociologist wishes to collect data or information from these two types of people.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225