Place values:
As each is in a different place value, when we add them neither will affect the other, meaning:

Answer: B 4.39
It’s A it’s honestly a simple equation just can’t explain it in typing
Rob has R quarters, and David has R + 24 or 24 more than rob, so together they have 2R+24
i think its f it just seems to be the most reasonable awnser a and i dont know this stuff :P
Step-by-step explanation:
From C in 1 hour they traveled 30 miles