Answer:
AAAUGCUGGAUUCGU
Explanation:
When you're working with DNA, you know that A=T, T=A, C=G, and G=C. However when you're transcribing DNA to mRNA, keep in mind that A=U, T=A, C=G and G=C. The reason A=U is because there is not a Thymine base in mRNA, instead it is Uracil. So whenever there is an A, transcribe it to a U, and transcribe the others as normal.
Hope this helps!