The surface area $S(r)($in square meters$)$ of a spherical balion with radus $r$ meters is given by $S(r)=4r^2.$

The thatus $P(t)($in meters$)$ atter $t$ seconds is geven by $P(t)=\frac{5}{3}t$

Write a formula for the surface ares $N(t)($in square meters$)$ of the sumson atter $t$ seconds.

It is not necessary to simplify.

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