Please hel ASAP How was education difficult to access before the Emancipation Proclamation when blacks were slaves?

In which research method does a researcher change the value of one variable to determine how the change affects another variable? a. experiment b. observational research c. survey d. case study

Cole's smart phone is two years old and he would like to have a new one. this time, he wants to make sure that it has a longer battery charge and better geographic coverage since he is traveling three days a week for his new job. cole is most likely to use for this purchase

Who is the speaker in this excerpt from book 13 of homer’s odyssey, and what inference can you make from the tone?