## Introductory Algebra for College Students (7th Edition)

a) Plug 20 as a into H = $\frac{7}{10}$(220 - a) H = $\frac{7}{10}$(220 - 20) H = $\frac{7}{10}$(200) H = 7(20) = 140 b) Plug 20 as a into H = $\frac{4}{5}$(220 - a) H = $\frac{4}{5}$(220 -20) H = $\frac{4}{5}$(200) H = 4(40) = 160