Question 1,3 and 5 please. Thank you

1. Which variance goes in the numerator of an ANVOA test and which variance goes in the denominator 2. How many groups can you test with an ANOVA and with a t test 3. In an ANOVA the independent variable is called a and the multiple versions of it are called 4. In one sentence explain the main reason we should not run multiple t tests when we have more than two groups. 5. Explain in one sentence why the variance of the data is a good substitute for the testing multiple means