90/18 equals 5 minutes for each window,so after 3 hours they would paint 36 windows. 180 minutes in three hours so 180/5=36
Okay. So, you want to figure out how many liters he pours into each truck? Well, you know he has 3 tucks, with 12 liters of oil. So, you will divide 12 by 3, and get 4. SO, he pours about 4 liters of oil into each truck.
Answer:4x^2 +28x +49=(2x +7)^2
Step-by-step explanation:
a2±2ab+b2=(a±b)2
In this case
a=2x and b=7 ...
4x2+28x+49=(2x)2+(2⋅
(2x)⋅
7)+72=(2x+7)2