Answer:
The correct answer is actually around 21%. Are you sure the question wasn't asking what the approximate percent decrease from 85 to 70 was? Because in that case it would be around 17%.
Step-by-step explanation:
R(2)=333*r(1)
C(1)=2πr(1)
C(2)=2πr(2)=2π*333r(1)
C(2)/C(1)=2π*333r(1)/2πr(1)=333
<span>circumference will increase by factor 333</span>
It takes 3 pumps 16 hours to empty a tank
Meaning it takes 48 hours for one pump by its self
So if there are 4 pumps
48/4 it would take them 12 hours
They would need to work 12 hours to do it in 1 day
Answer:
b
Step-by-step explanation:
4a²b⁴ - 25x⁶y⁴
(2ab²)² - (5x³y²)²
= (2ab² + 5x³y²)(<span>2ab² - 5x³y²) By difference of two squares</span>