This is true. All numbers that end in zero or five are divisible by 5, and a number that ends in zero is even, and all even numbers are divisible by two.
I believe 5x(8+3) is equal to 40x + 15x meaning those two numbers are the whole numbers you are looking for.
You have 2 factors (sinx)(cosx) = 0 As usual just set the factors = 0 sinx = 0 and cosx = 0 you will get the same answers with a lot less hassle. In my opinion (: I don't know if this is enough but hope it helps
The answer to this question is 540 square feet.
