Marcy is concerned that her findings may be due to an extraneous uncontrolled variable and not her treatment. marcy is most concerned with:

a. triangulation.

b. respondent validation.

c. external validity.

d. internal validity.

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)

Abox holds 500 paperclips. after a week on the teacher's desk 239 paperclips remained. how many paperclips were used?

The oates family went out for dinner the price of the meal was $33.95 the sales tax was 7.25% of the price of the meal . the tip was 15% of the meal and the sales tax . how much money did the oates family pay for the meal, including tax and tip