Question

laws of exponent : multiplication  and power to a power simplify

Answer 1

$(4r^4s^{-2})(-3rs^{-3})(rs)$

the whole expression is a multiplication

we must group what we can multiply

$(4\times-3)(r^4\times r\times r)(s^{-2}\times s^{-3}\times s)$

when multiply equal terms the exponents are added

so

$(-12)(r^{4+1+1})(s^{-2+(-3)+1})$

do the sum and the final expression is

$-12r^6s^{-4}$