Factor A, B, or C can each individually cause a certain disease without the other two factors, but only when followed by exposure to factor X. Exposure to factor X alone is not followed by the disease, but the disease never occurs in the absence of exposure to factor X.
Factor X is:
a. A necessary and sufficient cause
b. A necessary, but not sufficient, cause
c. A sufficient, but not necessary, cause
d. Neither necessary nor sufficient
e. None of the above

b. A necessary, but not sufficient, cause

Explanation:

Factor A, B, or C can each individually cause a certain disease without the other two factors, but only when followed by exposure to factor X.

Since, exposure to factor X alone is not followed by the disease, but the disease never occurs in the absence of exposure to factor X.

It can be concluded that Factor X is a necessary but not sufficient cause.

b. A necessary, but not sufficient, cause

Explanation: factor x is necessary for the disease to manifest but it is also dependent on the the presence of the other factors alongside it before it can cause the disease.

multiplying and dividing the two decimals and the eqations by the same number of the overalls