can you please help me :) thanks

Answer:
your first one is wrong the answer to that is 10.5
and then 2.5 three times
Step-by-step explanation:
Answer:
a.) 3.5 + 3.5 + 3.5 = 10.5
b). 2.5 + 2.5 + 2.5 = 7.5
Step-by-step explanation:
I hope this helps! Have a great day!!