Answer
a. $m^3$
b. $3m$
c. $-m^3$
d. $-3m$
Work Step by Step
a. When multiplying monomials you multiply the coefficients and the variables, then you multiply those two products $1\times1\times1=1$ &
$(m)\times(m)\times(m)=m^3$.
b. When adding like terms you add the coefficients $1+1+1=3$.
c. Same as a. $-1\times-1\times-1=-1$
d. Same as b. $-1+-1+-1=-3$
