What are some reasons that it is not always possible for researchers to carry out a study in an experimental ​framework? select all that apply.

a. subjects cannot be relied upon to behave as needed for the experiment.

b. when an opinion is sought with no interest in assessing the causality.

c. some studies can be unethical to carry out in an experimental framework.

d. a conclusion is needed sooner than it would take to set up an experiment.

In angle pqr find the measure of

Type the correct answer in each box, round your answers to the nearest integer 20 25 30 in the figure, the perimeter of hexagon abcdef is approximately w units, and its area is square units

The equation shown below represents function f. f(x)= -2x+5 the graph shown below represents function g. which of the following statements is true? a. over the interval [2, 4], the average rate of change of f is the same as the average rate of change of g. the y-intercept of function f is less than the y-intercept of function g. b. over the interval [2, 4], the average rate of change of f is greater than the average rate of change of g. the y-intercept of function f is greater than the y-intercept of function g. c. over the interval [2, 4], the average rate of change of f is the same as the average rate of change of g. the y-intercept of function f is greater than the y-intercept of function g. d. over the interval [2, 4], the average rate of change of f is less than the average rate of change of g. the y-intercept of function f is the same as the y-intercept of function g.