91Ó°ÊÓ

Solve each formula for \(k\) $$ y=k x $$

Add or subtract as indicated. Write each answer in lowest terms. $$ \frac{1}{2}+\frac{7}{8} $$

Exercises \(61-82 \text { involve factoring by grouping (Section } 6.1)\) and factoring sums and differences of cubes (Section 6.4). Write each rational expression in lowest terms. $$ \frac{1+p^{3}}{1+p} $$