Find the multiplicative inverse (or reciprocal) of $\left(-3\times \frac{7}{4}\right)$.

Find the multiplicative inverse (or reciprocal) of $\frac{15}{37}$.

Find the multiplicative inverse (or reciprocal) of $\frac{-21}{38}$.

Find the multiplicative inverse (or reciprocal) of $\frac{4}{5}\times \left(\frac{-2}{3}\right)$

Find the multiplicative inverse (or reciprocal) of $0$.

Find the multiplicative inverse (or reciprocal) of $\frac{75}{-63}$.

Find the multiplicative inverse (or reciprocal) of $-1$.

Find the multiplicative inverse (or reciprocal) of $\frac{-30}{-19}$.