4(5/8)= 2.5 squared feet per hour
The coordinates of vertex G are (2,0). I did this.
Simple interest formula:
Total = principal x (1 + rate x years)
10 years:
Total = 15,000(1+0.04x10)
Total = $21,000
8 years:
Total = 15000(1+0.04x8)
Total = $19,800
Savings = 21,000 - 19,800 = $1,200
He must've left you. My sincere apologies.