Well, their speeds are (

is Jack's speed, and

is Richard's.

They, together, can paint 12 houses in 35 days. To get a single house, we only have to calculate

which is very close to 3 (a bit below)
Answer:
choice 2) 4/3πr³
Step-by-step explanation:
Answer:
6 miles
Step-by-step explanation:
first thing you need to do is find a number under 18 that can be multiplied by 3
3
6
9
12
15
18
and 18 is the 6th number and is 18, you can add the 2 extra fixed charge to that
they can travel 6 miles
but if you're talking about a fixed charge per mile then dont use this! ^^
I'm not at my desk and can't check it out right now.
But I think you should try 10 and -42 .