Answer:
9 is the right answer
Step-by-step explanation:
I. If c = - 4 and d = 10
then
= 
= 
= 9
Hope that help :D
See the attached picture:
Step-by-step explanation:
4/9A = 12
A = 12×9/4
= 27
......
What's Ratinal? Do you mean rational? If so, you're right.
Did you find the answer? I could use the help with it too.