Answer:
6 units
Step-by-step explanation:
They are on the same y-point and so you just have to count the spaces between them on the x-axis.
Integrating both sides once gives
where 
is an arbitrary constant vector. Use the initial condition to find its value:
Integrate again:
where 
is another arbitrary vector of constants. Use the other initial condition to determine its components:
Then the particular solution to this ODE is
<span>A = pi r^2
dA/dt = 2 pi r dr/dt
dr/dt = 15 cm/s
a) r = 30
dA/dt = 2 pi (30) (15) = 900 pi cm^2/s
b)
A = 9 = pi r^2
r = 3 / sqrt(pi)
dA/dt = 2 pi( 3/sqrt(pi)) (15) = 90 sqrt(pi) cm^2/s</span><span>
</span>
Ans is <span>y, because Triangle JHK is similar to triangle LMK</span>
