Y<-60
hope this helps and good luck;)
8.5 yd/1 * 3ft/1yd ................
The formula you want is: fv=p(1+int/c)^(nc)
future value
principal
int
compound
years
When writing the equation keep in mind that 7 + x is said as a term that is squared so it has to be squared while it's still together; (7 + x)².
I hope this helps you
6×(9-c)
c=3
6×(9-3)
6×6
36