The witches are the ones who give Macbeth the prophecy that he will one day become king, that Banquo with father kings, and that Macbeth can not be killed by anyone born of woman. These set off Macbeth's entire journey in the play and motivate him to kill the king, kill Banquo, and ultimately lead to his downfall.
18/100 or 9/50
To find it you have to get like denominators. So, I multiplied the denominator, 10, by 10 and then I multiplied the numerator, 1, by 10. Then I got 10/100. So, I added both fractions together and got 18/100.
Ask if you need more clarification.
