Distribute the 3a^n to all the other values then solve...
(3a^n*a^n)+(3a^n*a^n)+(3a^n*-1)
4a^2n+4a^2n-3a^n=
8a^2n-3a^n
Dude, this is simple addition. 28.35 + 17.26 = 45.61
He now has $45.61
Answer:
surface area of rectangle= 2[(l+w) +(l+h). +(w+h)]
hope it helps
Answer:
44.95
Step-by-step explanation:

Two decimal places = 44.95