The circle expands it radius 20m each day. From this description you can get this equation:
r=0+ 20*d
r=20d
The oil slick expands as a circle and the formula for circle area is

r^2. If you insert the first equation into this equation you will got:
circle area =

r^2
circle area =

(20d)^2
circle area =

400*d^2
Answer:
X=7.9
Y=7.9
Step-by-step explanation:
We have that x=y
And form Pythagoras theorem we have

So x = y = 7.9
Remember the chain rule.
L(x)=f(g(x))
L'(x)=f'(g(x))g'(x)
take the derivative of f(g(x)). just treat them like they are variables. so you get:
h'=f'(g(x))g'(x)
now plug in your x value and evaluate:
h'(1)=f'(g(1))(g'(1))
substitute in values that you know and evaluate again
h'(1)=f'(3)(-3)
h'(1)=(-5)(-3)=15
Answer:
50%
Step-by-step explanation: