X/28 = 5/7
x = 28 * 5 / 7
x = 20
answer
x = 20 ft
Answer:

Can I have the brainliest please?
Answer:
The total volume of the composite figure is 420 ft³.
Step-by-step explanation:
I'm not sure but I solved it as fast as I could
I apologize if it's incorrect :(
15 can be 15/1 = 30/2
30/2 + 9/2 = 39/2