Professor clayton hypothesizes that travel to other countries increases students' abilities to do well in advanced sociology classes, so she conducts a survey study to test this. which variable is her independent variable? a. the survey b. travel to other countries c. the research methods d. students' abilities

The independent variable is b. travel to other countries

Step-by-step explanation: Independents variables are the input while dependent variables are the output. In this example, Professor Clayton will use travel/not travel to other countries as the input of the study. The results from the survey will be the output of the increase in students' abilities in relation to the fact that they traveled or not to other countries.

a.

step-by-step explanation:

step 1 distribute 2 to every term in the parentheses

step 2 add 10 on both sides of the equal sign