Answer:
It is
Step-by-step explanation:
Using Pythagoras 51^2 = 50^2 + b^2
b=10.0499
The correct answer should be B because it does cross the y-axis at -5 and it does decres from x = -10 till x = -2 and then does remain constant till x=10
The answer to the questions is 2.359
<u>Solution-</u>
A pebble is dropped into a calm pond, causing ripples in the form of concentric circles.
The radius of the outer ripple is given by r(t)= 0.6t,
where t is the time in seconds after the pebble strikes the water.
The area of the circle is given by the function 
(a ◦ r)(t) = a(r(t)) ( ∵ Using function composition / plugging in the second function into the first function)
⇒![a(r(t))=a[0.6t]=(\pi)(0.6t)^2=0.36 \pi t^2](https://tex.z-dn.net/?f=a%28r%28t%29%29%3Da%5B0.6t%5D%3D%28%5Cpi%29%280.6t%29%5E2%3D0.36%20%5Cpi%20t%5E2)
∴ This is the expression for area of circle of outermost ripple, at time t after the pebble strikes the water.