The sum of two or more binary variables must be less than or ...

[lidoalex]

The sum of two or more binary variables must be less than or equal to one in a _____ constraint.
 a. corequisite
  b. conditional
  c. multiple-choice
  d. mutually exclusive

Question 2

In a linear regression model, the variable (or variables) used for predicting or explaining values of the response variable are known as the ________________. It(they) is(are) denoted by x.
 a. dependent variable b. independent variable
  c. residual variable d. regression variable

[bbburns21]

Answer to Question 1

d
RATIONALE: In a mutually exclusive constraint, the sum of two or more binary variables must be less than or equal to one.

Answer to Question 2

b
RATIONALE: The independent variable(s) is the variable (or variables) used for predicting or explaining values of the response variable. It(they) is(are) denoted by x.

[lidoalex]

Great answer, keep it coming

[bitingbit]

Gracias!