I don't understand why I got these wrong. Please help.

Incorrect Question 1 0 / 4 pts Suppose in a linear regression the categorical variable CONTINENT can take on the values North America, South America, Europe, Asia, Africa, Australia, Antarctica. How many indicator variables should be used? 7 Incorrect Question 2 0 / 6 pts Suppose you have a model predicting INCOME from IQ that you wish to modify to control for GENDER (a binary variable). Write the new model. Use b_i for your coefficients with appropriate indices. This question may need to be graded manually. Be sure to ask for feedback if it is marked as incorrect. INCOME = 1Q GENDER