1) 12 cookies per hour
2) train travels 80 miles per hour
4/(1+3) or

Addition is the first step for two reasons.
1) the Order of Operations requires you do operations in parentheses first
2) the division cannot be performed until you know what you're dividing
If you have the area of the rectangle, then the equation would be A = W*L
Lets say the area is 15 and the width is 3. You don't know what the length is. Just divide 3 into 15 to get 5. Hope this helps!
Volume=pi*r squared*h
Volume=pi* 2 squared*3
volume=pi*4*3
volume=pi*12
volume=12pi
Answer is first one. 12pi
4(X+Y)+Y+2(Y+5)+6X
4X + 4Y + Y + 2Y + 10 + 6X
4X + 6X + 4Y + Y + 2Y + 10
10X + 7Y + 10