A study showed that people who take vitamin C daily have a significantly better chance of protecting against a cold than those who did not take the vitamin daily. Which of the following statements is correct?

I. This is an observational study and not an experiment.

II. This study provides evidence that taking vitamin C daily contributes to protecting against a cold.

III. The general health consciousness of people who take vitamin C could be a confounding variable.

a. I only

b. III only

c. I and III only

d. II and III only

e. I, II, and III

x=-2

infinite number of lines, so there is an infinite number of equations.

step-by-step explanation:

there are an infinite number of line that passes through the point (-2,5)

x=-2   is one line that passes through the point

y = 5 is another line that passes through the point

(these two lines are perpendicular to each other).

since the number of   numbers are infinite and the slope is the ratio of two numbers,(change in y over change in x) we can have an infinite number of slopes.     our only condition is that it passes through the point (-2,5)

a) 0,0; 1,1; and 2,2

step-by-step explanation:

these have the exact same coordinates, thus they are the correct function.

ok so what's the question?

step-by-step explanation: