1. 4/10 are vowels, so 2/5 the first answer
2. Picking two vowels in a row would be 4/10 x 4/10
3. Picking two vowels but not replacing one would be 4/10 x 3/9
4. The last one is 100% gonna happen, so that would be 1
2 and 3 I've done most of the work for you, you just have to multiply the fractions. Good luck!