(a) The area is given by
... A = π·r²
The rate of change of area is the derivative of this with respect to time.
... dA/dt = π·2r·dr/dt
For the given conditions, this evaluates to
... dA/dt = π·2·(5 ft)·(3.5 ft/s) = 35π ft²/s ≈ 109.96 ft²/s
Answer:
-4
Step-by-step explanation:
Each student got 17 pencils
(429-5)/25=x
6
1. X3, 15x - 10y = 80 15x - 7y = 51
-17y = 29
2. 8 = 1/60 + a. 8 - 1/60 = 7.98333333333
6 = 1/80 + b. 6 - 1/80 = 5.9875
13.9708333333
3. I genuinely dont know sorry.
4. Pencil = $0.05. Pen = $1.05