Aloha! First, add $20 and $20 and $20 and $20 because of the one $20 bill and the two ten dollar bills.
Add the 10 quarters which is 2.50 and add 12 nickles 60 cents or .60 then add 2 pennies. The answer is $83.12 cents. Now divide that by 4 which is 20.78 So to answer your question: 20.78 is how much each charity would get. I hope this helps!:)
So if there are 3 $20, 2 $10, 10 $0.25, 12 $0.05 and $.02, it would add up to $83.12. If he splits this money evenly into 4 groups, it would be 83.12/4, which is 41.56/2, which simplifies to $20.78 per charity! :)
For the triangle, you use the formula A=1/2bh. So in this case it's 3×4×1/2. 3×4 is 12, times 1/2 is 6 m. Now for the rectangle it's just 2×4 which is 8. 8+6 is 14. Hope this helps! If you are still confused please comment!